How To Check If A Package Is Installed In Python?

Using importlib.util module of Python to check for installed packages A package by the name of importlib has a module called util which has a function called find_spec which can also help to find if a package is installed or not without importing the package. The find_spec module will look for the package and if not present, it will return null.
– Go to the https://pypi.org/ website find the package you want to install – From the menu on the left-hand side click the download files button. – Here I have taken the example of the selenium library. – Make sure to download.tar.gz file

How to check if a Python package is licenced?

If you are using python code for commercial purpose, knowing the package’s license is important. How to Check if Python module is installed? You can use pip commands with grep command to search for any specific module installed on your system. For instance, you can also list out all installed modules with the suffix “re” in the module name.

How do I find a list of all installed packages in Python?

Execute commands at the command prompt or terminal. In some environments, use pip3 instead of pip. In some cases, pip is for Python2 and pip3 is for Python3. pip list displays a list of installed package names and version numbers. There are four display formats: legacy, columns, freeze and json.

How do I check if a module is installed in Python?

Modules in the standard library do not have individual versions, but follow the Python version. If you are using the Python package management system pip, you can check the information of the installed package with the following command. Execute commands at the command prompt or terminal.

How do I find out if I’ve installed a package?

To find out whether you’ve installed a.deb,.rpm, etc. package, you need to use the appropriate tools for your packaging system. APT has a Python wrapper named python-apt in Debian, or just apt at PyPI.

How do I check if a package is installed in Python?

Check the version of Python package/library

  1. Get the version in Python script: __version__ attribute.
  2. Check with pip command. List installed packages: pip list. List installed packages: pip freeze. Check details of installed packages: pip show.
  3. Check with conda command: conda list.

How do I know if a package is installed?

The dpkg-query command can be used to show if a specific package is installed in your system. To do it, run dpkg-query followed by the -l flag and the name of the package you want information about.

How can I tell what Python modules are installed?

In the standard Python interpreter, you can type ‘ help(‘modules’) ‘. At the command-line, you can use pydoc modules.

Where is Python package installed?

Typically, that means Python and all packages will get installed to a directory under /usr/local/bin/ for a Unix-based system, or \Program Files\ for Windows. Conversely, when a package is installed locally, it’s only made available to the user that installed it.

How do I know if python3 is installed?

Simply run python3 –version. You should get some output like Python 3.8. 1 if Python 3 is installed.

How do you check if a yum package is installed?

How to check installed packages in CentOS

  1. Open the terminal app.
  2. For remote server log in using the ssh command: ssh [email protected]
  3. Show information about all installed packages on CentOS, run: sudo yum list installed.
  4. To count all installed packages run: sudo yum list installed | wc -l.

Which command would you use to see if a package is already installed?

1. b) Using whereis command. The ‘whereis’ command is used to search the binary, source, and man page files for a given command. If the following output shows the location of a given package binary or executable file, the given package is already installed on the system.

How do you check JQ is installed or not?

Procedure

  1. Run the following command and enter y when prompted. (You will see Complete! upon sucessful installation.)
  2. Verify the installation by running: $ jq –version jq-1.6.
  3. Run the following commands to install wget: $ chmod +x./jq $ sudo cp jq /usr/bin.
  4. Verify the installation: $ jq –version jq-1.6.

How do I list installed packages in pip?

To do so, we can use the pip list -o or pip list –outdated command, which returns a list of packages with the version currently installed and the latest available. On the other hand, to list out all the packages that are up to date, we can use the pip list -u or pip list –uptodate command.

How do I know if a PowerShell module is installed?

The Get-InstalledModule cmdlet gets PowerShell modules that are installed on a computer using PowerShellGet. To see all modules installed on the system, use the Get-Module -ListAvailable command.

How do I know if Numpy is installed?

Go to Python -> site-packages folder. There you should be able to find numpy and the numpy distribution info folder. If any of the above is true then you installed numpy successfully.

How to list installed Python packages?

– Start the Anaconda Navigator application. – Select Environments in the left-hand column. – A dropdown box at the center-top of the GUI should list installed packages. If not, then select Installed from the dropdown menu to list the packages.

How can I find where Python is installed on Windows?

  • Keep all the softwares updated.
  • Never download anything from an unreliable website.
  • Don’t download the e-mail attachments you are unsure of.
  • Whenever you want to download and run any program (especially.exe files),always get is checked from websites like Free Online Virus,Malware and URL Scanner
  • Avoid click
  • How to build your very first Python package?

  • Choose Your API. The first real step into turning your code into a package,is deciding how users should use it — and make it importable.
  • Document. Documentation is like lining up in a queue — we wish everyone would simply do it,but we tend to cut ourselves some slack whenever we can.
  • License.
  • Rearrange for Packaging.
  • Sign-Up to PyPI.
  • Build&Deploy!
  • How to check if a Python package is installed

    The purpose of this tutorial is to teach you how to determine whether or not a Python package is installed on your local system that is running Python. We need to know how to import them as well as how to determine whether or not they have been installed.

    Checking for installed Python packages

    • A Python package is a collection of modules and smaller packages that work together. Aninit.py file must always be included in a Python package containing Python code. There are a variety of techniques for determining if a Python package has been installed or not. Three of these are addressed in further detail below: -Making use of the import statement
    • Pip can be used without importing a package
    • The importlib.util module is responsible for importing libraries from other programs.

    Using the import keyword in Python

    • Importing a package can be used to determine whether or not a package has been installed.
    • If it is properly installed, it will not display any errors.
    • If it is not installed, on the other hand, an import error message will be displayed.
    • Another method of accomplishing the same goal is through the usage of exception handling.
    1. The following is a basic example of how to write the same thing.
    2. try: import pandas with the exception of ImportError as err: (err) If we do not have pandas installed, we will see the following output.
    3. There is no such module as ‘pandas’.
    4. If, on the other hand, pandas is already installed, there will be no error message.

    Pip without importing the package in Python

    • Another approach to determine whether or not a package has been installed is to run the pip freeze command in the terminal.
    • This will provide you with a list of all of the packages that have been installed.
    • If you want to search for a certain package on a Linux terminal, you may do so by using the grep command, as demonstrated in the following line of code: grep numpy |
    • pip freeze |
    1. grep numpy If NumPy is present, the following output is produced: -numpy==1.18.1.
    2. If NumPy is not installed, the terminal will display an error message instead of output.
    3. Instead of using grep on Windows, we may use findstr, which looks for a specific word in a provided list in the same way as grep searches for a specific word on Linux.

    Using importlib.util module of Python to check for installed packages

    • A package by the name of importlib has a module by the name of util, which contains a method by the name of find spec that may be used to determine whether or not a package is installed without importing the package.
    • In this case, the find spec module will search for the package and, if it is not found, it will return null.
    • The following is the code for the aforementioned item: Import importlib.util def main() import importlib.util def main() find spec(package) will seek for the package if is present is set to true.
    • package=’tensorflow’ is present = importlib.util.find spec(package) None: print(package name + ″is not installed″) print(package name + ″is not installed″) if not, print (″Successfull″) ifname ==’ main ‘: the main function () If TensorFlow is not installed, the following will be the result of the operation: Tensorflow is not installed on this computer.

    See Also:

    • Managing Packages in Python with the pip package manager
    • How to create your own Python package with the Python programming language
    • In Python, learn how to add packages to the Anaconda environment.

    How to find Python List Installed Modules and Version using pip?

    • Do you wish to find out which Python versions are currently installed on your system?
    • In addition, I have recorded a video that includes a live demo.
    • You may either watch the video or continue reading.
    • The availability of a large number of external libraries is the primary strength of the Python programming language.
    1. As we continue to code in Python, we install a large number of packages.
    2. It is simple to obtain a list of Python modules that have been installed on the system.
    3. There are a variety of approaches you might use to do this.
    4. The following are the two methods that will work for you in order to obtain this list…

    1. Using help() function (without pip):

    • One of the easiest methods is to start a Python terminal and execute the following command…
    • help(″modules″) This will provide a list of all the modules that have been installed on your system.
    • This list comprises all of the modules and packages that are pre-installed with your Python installation, as well as any additional modules and packages that you have added directly.
    • Here’s an example of how to use the help feature on my computer (Python version 2).
    1. A HUGE list:O You do not need to install any other modules in order to access this list, which is provided by the help() function.
    2. However, you will not receive any more information on the package as a result of this command.
    3. The pip program may be used to find out the version number of each module that has been installed.

    2. Using pip to find Python list installed modules and their Versions:

    • The pip tool may be used to obtain a list of the Python packages that have been installed on the system.
    • Those who are unfamiliar with pip should know that it is the most effective software for installing and managing other Python programs on your computer.
    • More information may be found in the comprehensive guide for managing Python modules with pip, which can be found here.
    • If you have the most recent version of Python, pip is already preloaded with the language.
    1. the command line should contain the following commands: (not on Python console).
    2. You will receive a detailed list of all the Python modules that have been installed, along with their versions.
    3. pip freeze or pip list are two options.
    4. Here’s an example of how to list the Python packages that are currently installed on your system using the pip command line tool.
    5. In contrast to the help function, it does not provide a list of the Python packages that have already been installed.

    You may see a list of all the Python packages, each with a version number.It is important to note that before running this command, you should check to see if pip is installed on your system.It comes pre-installed with Python for Python versions 2.7 and above, as well as 3.4 and higher.

    The output list of both commands has a completely different format from the other.Assume you are using these commands in a shell scripting environment.You can use any of the commands that you find simple to use to parse the output package list and obtain the information that you want.This command can be used in conjunction with any other command if you already have parsing code for any of the output from the two commands.

    Related Read this article to find out why you should learn Shell scripting.(Python versus Shell Scripting) (Python vs Shell Scripting) Run the command to get additional information about a certain module.pip show getopt is a command that displays the options for a program.

    It returns the following information: the name of the module/package, the version, the author’s email address, the license, the location of the installed module, and the requirements.You can obtain the author’s email address.Any particular question about the Python package can be directed to the author, who will respond as soon as possible.If you want to use Python code for commercial purposes, it is critical that you understand the licensing of the package in question.

    How to Check if Python module is installed?

    If you want to search for a certain module installed on your system, you may combine pip commands with the grep command. grep getopt pip list | grep getopt For example, you may list out all of the installed modules that include the suffix ″re″ in the module name in a single line. grep re | pip list | grep re

    How to count the number of Python modules installed on your system?

    You may use the wc (word count) command to keep track of how many words you have written. the pip list | the wc -l Please keep in mind that the grep and wc commands are only compatible with Linux-based computers.

    What is the use of these commands?

    • You may use these commands to get a list of all the modules that are currently installed on your system. Later on, you may use this list to create a new environment that is identical to the previous one.
    • If you encounter a problem with the Python package that you have installed, performing these instructions will make troubleshooting much easier.
    • By knowing the version of a Python module, you may decide whether to update the module when a new version of the module becomes available.
    • What Comes Next?
    • Check out these 39 Most Useful Python Modules, which are responsible for 95% of all Python jobs.
    • How to construct a Python program to retrieve a list of Python packages and save them in an array will be covered in a later post.
    • Stay tuned for that.
    1. If you find these Python list installed modules commands to be useful, please pass them on to your friends.
    2. Alternatively, if you have any questions on how to handle Python packages, please leave a comment.
    3. Pythoning is a great sport!
    See also:  What Are Last Four Digits Of Zip Code?

    Check the version of Python package/library

    • Published on: 2019-09-20 / Python is a kind of programming language. This article discusses how to determine the version of Python packages (libraries) and modules that are being used in scripts, as well as the version of Python packages that are being used in the environment. In a Python script, you may get the version number: versionattribute
    • Use the pip command to verify. pip list displays a list of all the packages that have been installed.
    • List the packages that have been installed: pip freeze
    • Pip display may be used to see the details of the packages that have been installed.
    • Check with conda command: conda list

    If you want to know what version of Python you’re running, check out the following article. Check the Python version from the command line as well as in the script.

    Get the version in Python script:versionattribute

    • The versionattribute function may be used to determine the version of a package that is being used in a Python script. pandas as a pd print file import (pd. version) The 0.22.0 versionattribute is encouraged by PEP (Python Enhancement Proposals), and it is present in a large number of packages. PEP 396 – Module Version Numbers | Python.org
    • PEP 8 – Style Guide for Python Code | Python.org
    • PEP 396 – Module Version Numbers | Python.org
    • PEP 396 – Module Version Numbers | Python.org
    • It should be noted that the versionattribute is not required, and so some packages do not have it. Along with the versionattribute, there are packages that give functions and characteristics that show additional information, such as a version number. Check the NumPy version with np.version
    • check the Pandas version with pd.show versions
    • and check the Python version with pd.version.

    It should be noted that the version of standard library modules such as math and os is not set. Modules in the standard library do not have their own versions; instead, they are based on the current Python version.

    Check with pip command: pip list, pip freeze, pip show

    • If you are using the Python package management system pip, you can use the following command to find out what information is contained within the installed package.
    • Commands can be executed at the command prompt or terminal.
    • In some circumstances, pip3 should be used in place of pip.
    • In certain circumstances, pip is used for Python2 while pip3 is used for Python3; see the examples below.
    1. Please review the following page for introductory information on how to use pip, including how to install, update, and remove packages, among other things.
    2. How to make advantage of pip (Install, update, uninstall packages)

    List installed packages: pip list

    • Pip list gives a list of the names and version numbers of the packages that have been installed.
    • $ pip list PackageVersion – – absl-py0.1.10 agate1.6.0 agate-dbf0.2.0 agate-excel0.2.1 agate-sql0.5.2 appnope0.1.0 absl-py0.1.10 agate-dbf0.2.0 absl-py0.1.10 absl-py0.1.10 absl-py0.1.10 absl-py There are four different display styles to choose from: legacy, columns, freeze, and json, among others.
    • It can be set in the pip configuration file pip.conf or with the -formatoption flag in the pip command line.
    • There are a number of settings that may be utilized with pip list.
    1. -format Format the display according to your preferences (columns, freeze, json)
    • -o, -outdated
    • List only out-of-date packages
    • -u, -uptodate
    • List only the latest packages

    For further information, please see the following article. With pip list/freeze, you can see all of the Python packages that are currently installed.

    List installed packages: pip freeze

    • A list of installed package names and version numbers is displayed with the pip freeze command, which is in the freeze format. pip freeze at $ absl-py==0.1.10 agate==1.6.0 agate-dbf==0.2.0 agate-excel==0.2.1 agate-sql==0.5.2 appnope==0.1.0 absl-py==0.1.10 agate==1.6.0 agate-dbf=0.2.0 agate-excel==0.2.1 agate-sql==0.5. It is important to note that the difference between pip freeze and pip list -format freeze is that pip freeze does not by default display any of the following package management tools: If you provide the -all option, the whole list will be shown. setuptools
    • distribute
    • wheel
    • pip
    • setuptools
    • wheel

    It is possible to install packages in a particular version in a batch if the output is saved as text in freeze format. Installing Python packages using pip and requirements.txt is described in detail here.

    Because it is not necessary to identify package management tools such as pip for such purposes, pip freeze does not show them by default.

    Check details of installed packages: pip show

    • Pip show is a command that displays extensive information about a particular package.
    • Additional information, such as dependent packages and homepages, is presented in addition to the version information.
    • $ pip display pandas a list of pandas Pandas are given this name.
    • Version: 0.22.0, with a brief summary: Data structures provide a lot of power for data analysis, time series, and statistics Home-page: The PyData Development Team is the author; the author’s email address is [email protected]
    1. BSD is the license for this work.
    2. Site-packages are located at /usr/local/lib/python3.6/site-packages.
    3. Python-dateutil, pytz, and numpy are required.

    Check with conda command: conda list

    If you have used Anaconda to create a Python environment, the command conda list will display a list of the packages that have been installed in the current virtual environment. You may use conda list -n to see whether the environment has not been enabled yet.

    Check if one package is installed in my system with Python?

    The term ″package″ has a half-dozen comparable but incompatible definitions, but the fact that you asked about ″package or module″ shows that you are especially interested in Python packages and modules, as in the objects that may be imported into Python.Consequently, importing them is the most effective method of testing.Manually, follow these steps: >>> python $ python add foo to the mix There is no module named foo, which results in an import error.Foo, on the other hand, isn’t installed.Attempt the following programmatically: import foo with the exception of If foo is not present, you can do anything you wish with the data.

    It should be noted that this does not indicate that foo is missing, but rather that it was unable to be imported.For the most part, when writing a basic ″test whether you have this″ script, this is what you want to really check for.But what if you really want to see if anything ″is installed (even if it’s broken)″ on your computer?If you’re using a recent Python version (I believe 3.4 or higher), the ImportError will have extra information that you can access—name for the name you were trying to import, path if the name was discovered, and so on.However, this is one of those instances in which EAFP may not be superior to LBYL in this situation.You may use importlib to search for a module without actually attempting to import it, as in: importlib search for module Find a specification using this function: spec = importlib.util.find spec (‘foo’) What happens if you’re using an earlier version of Python?

    In older versions of the software, there are similar features, but they aren’t nearly as pleasant, and if you’re still using 2.7, there’s absolutely nothing worth utilizing because the import mechanism wasn’t exposed very properly.To handle this situation (as well as many other cool things related to package installation), use setuptools—which isn’t included in the standard library, but is used by a large number of third-party packages and was, until recently, considered to be the cornerstone of Python package installation, even if it wasn’t officially supported: pkg resources.get distribution (‘foo’) That, on the other hand, searches for a distutils/setuptools/PyPI package rather than a Python module or package.Despite the fact that there is a lot of overlap between them, they are not exactly the same thing.For example, when you pip install more-itertools, you will receive the more-itertools PyPI package, which will then install the more itertools Python package into your site-packages directory, as seen below.

    Updated answer

    • A better approach to go about it is as follows: subprocess for importing import sys reqs = subprocess.check output() installed packages =for r in reqs.split()] import sys reqs = subprocess.check output() As a result of this: print(installed packages) The terms ″Django,″ ″six,″ and ″requests″ are all used in this context. Check to see whether requests has been installed: If the word’requests’ appears in the installed packages: Make a decision. What is the reason behind this? There are occasions when the names of two apps are the same. It is not possible to get a complete view of what is installed on the system by importing from the app namespace only. Take note that the following solution is effective: In the case of pip, when installing from PyPI or from any other alternative source (such as pip install or any other archive type)
    • When installing manually using the python setup.py install command, the following error occurs:
    • For example, sudo apt install python-requests is used when installing from system repositories.
    • The following are examples of when it might not work: In development mode, such as using python setup.py develop
    • while installing in production mode
    • For example, if you use the pip install command to install in development mode, the output will be as follows:

    Old answer

    A better method to accomplish this is to use the following syntax: import pip installed packages = pip.get installed distributions () For pip versions greater than 10.x, use: pip.internal.utils.misc is derived from this.get installed distributions is an import function.What is the reason behind this?There are occasions when the names of two apps are the same.

    It is not possible to get a complete view of what is installed on the system by importing from the app namespace only.pkg resources is returned as a consequence of this operation.Objects for distributing information Consider the following as an illustration: install packages and then print them Django 1.6.4 (/path-to-your-env/lib/python2.7/site-packages), Six 1.6.1 (/path-to-your-env/lib/python2.7/site-packages), Requests 2.5.0 (/path-to-your-env/lib/python2.7/site-packages) and Requests 2.5.0 (/path-to-your-env/lib/python2.7/site-packages) Make a list of everything: flat installed packages = [″Django,″ ″six,″ ″requests,″] flat installed packages = [″Django,″ ″six,″ ″requests,″] Check to see whether requests has been installed: inflate installed packages: if’requests’ is present Make a decision.

    How to List Installed Python Packages

    The Pip, Pipenv, Anaconda Navigator, and Conda Package Managers are all capable of displaying a list of Python packages that have been installed.You may also use the State Tool, which is part of the ActiveState Platform’s command line interface (CLI), to view a list of all the packages that have been installed.Simply type ″state packages″ to get a list of all the packages that have been installed.It is possible to obtain a complete list of all packages and dependencies (including OS-level and transitive dependencies, as well as shared libraries) by utilizing the Web-based interface, which gives a comprehensive Bill of Materials view.Create a free ActiveState Platform account to give it a go and see how it works for you.

    Before attempting to obtain a list of installed packages, it is usually a good idea to verify that the most recent versions of Python, Pip, Anaconda Navigator, and Conda are in use.

    List Installed Packages with Pip

    Both pip list and pip freeze will return a list of the packages that have been installed; the results will be presented in a different format.Keep in mind that pip list will provide a list of ALL of the packages that have been installed (regardless of how they were installed).Pip freeze, on the other hand, will only display the packages that have been installed by Pip.As an illustration: PackageVersion – – absl-py0.7.0 was returned by pip list.freezing of pip The following is the output: absl-py==0.7.0

    List Packages in a Console with Pip

    The following script may be used to list all of the packages that have been installed from a Python terminal using pip: >>> installed packages = pkg resources.working set installed packages list = sorted([″ percent s== percent s″ percent (i.key, i.version) for I in installed packages]) import pkg resources installed packages = pkg resources.working set print(installed packages list) Output: [‘absl-py==0.7.0’, ‘adodbapi==2.6.0.7’, ‘alabaster==0.7.12’, ‘alembic==1.0.7’, ‘amqp==2.4.1’, ‘anyjson==0.3.3’, ‘anyjson==0.3.3’, ‘anyjson==0.3.3’, ‘anyjson==0.3.3’,

    List Modules in a Console without Pip 

    • You may use the following command to display a list of all installed modules from a python prompt without using pip: >>> help (″modules″) It should be noted that there are certain disadvantages to taking this strategy, including: This technique can take a long time to import each module before it can scan the path of that module for sub-modules if there are a large number of packages loaded.
    • Modules that include code that is not contained within an ifname== ″ main ″: code block, and in which user input is required, may cause the code to enter an endless loop or hang.

    List Installed Packages with Pipenv

    A pipfile.lock file may be generated in a pipenv environment using the pipenv lock -r command, which can be used to create output.The result will provide a complete list of all packages, including their dependencies.As an illustration: lock pipenv using the -r switch Output: -icertifi==2019.11.28 chardet==3.0.4 idna==2.9 requests==2.23.0 urllib3==1.25.8 chardet==3.0.4 idna==2.9 requests==2.23.0

    List Installed Packages with Anaconda Navigator

    • For Anaconda Navigator to display a list of the packages currently installed in an Anaconda environment, perform the following steps: Begin by launching the Anaconda Navigator application.
    • Environments can be found in the left-hand column.
    • A dropdown box should be located in the center of the GUI’s top bar, listing all of the packages that have been installed. To see all of the packages that have been installed, click Installed from the dropdown menu.

    List Installed Packages with Conda

    Using the conda list command, you may see a complete list of all the packages in your conda environment: conda list is an abbreviation for Conda List. The following is the output: packages in the environment at C: \ The following are the requirements for Anaconda2 4.3.1: _license1.1 py27 1 alabaster 0.7.9py27 0

    Globally vs Locally Installed Packages

    The following article provides information on how to generate a list of installed packages that is both globally and locally distributed: How to List Globally Installed Packages versus Locally Installed Packages in Python

    List Installed Packages with the ActiveState Platform

    Run the following command on the command line to get a list of Python packages that have been installed in your currently active project that is built on the ActiveState Platform: state Bundle deals for shows The result contains a complete list of all of the packages that have been installed in your current project: matplotlib, numpy, and pandas are examples of programming languages.scikit-learn scipy is a Python library that allows you to learn new things.Through the ActiveState Platform’s Web-based graphical user interface (GUI), you may acquire a comprehensive software bill of materials view of all packages, dependencies, transitives dependents (i.e., dependencies on dependencies), OS-level dependencies, and shared libraries (for example, OpenSSL).

    Check Installed Modules in Python – Javatpoint

    There are several occasions when we are working on someone else’s system and we are required to complete our assignment while on the other system.When we have to install all of the essential components in that system, things get much more stressful.When we have to start again from the beginning of a project when we are in the middle of it, the mess is really worse.The same is true if someone else is working on our system as part of their own project while we are away.To avoid wasting our valuable time by running installation commands for modules that are already available in the system, we desire to be aware of which modules are already present in the system in such situations, as well as in many other situations.

    It is also useful when we want to conduct a specific action in our program and we know that we have these modules available in our system and that we can utilize these functions to do that specific activity.To save time and avoid wasting extra time, we will learn how to check for Python modules that have been installed on a system and how to obtain a list of all of the installed modules in this lesson.

    Checking All Installed Python Modules

    As we have already covered, there are several reasons why we would want to verify the list of all Python modules that have been installed on our system, as well as the benefits of having this information on hand.Now, we’ll go over the various methods for checking all of the Python modules that have been installed on our system and obtaining a comprehensive list of them.Even better, we can use the pip installer to check whether or not any Python modules are now present in the system, as well as whether or not any Python modules have been installed in our system, all from the command line.In this part, we will use the two techniques described below to check for all of the Python modules that have been installed on our system and to get a list of all of them:

    1. Check for all Python modules that have been installed locally
    2. Examine all of the Python modules that have been installed.

    Consider the implementation of both methods by executing them and retrieving a list of all Python modules that have been installed in conjunction with them.

    Method 1: Check All Locally Installed Python Modules:

    We can keep things simple if all we want to do is check all of the Python modules that have been installed locally.This job may be completed in the Jupyter notebook or Jupyter lab, however it requires that we first open our Python shell (where the result is shown) first.To execute the following command in the Python shell (or in Jupyter notebook and Jupyter lab), we must type it into the shell as follows: As soon as we click the enter key after executing the previously mentioned command, the Python shell will begin loading the names of all the locally installed Python modules on our system, and we will be able to see the following status pane on our computer’s screen: According to what we can see, the Python shell is now loading a list of all of the locally installed Python modules, and it will take some time before it is able to retrieve the names of all of the locally installed Python modules.There is a little period of time required before it displays all of the Python modules that have been installed locally on our machine, as seen in the following output screen: We can see the names of all of the locally installed Python modules that are now available in our system, and we can also store them for future reference in this section.

    Method 2: Check All Python Modules Installed:

    We may use the ‘pip’ command with the following two commands to check for all of the Python modules that have been installed:

    1. Using ‘pip freeze’ command
    2. Using ‘pip list command

    Let’s put both instructions to use in order to have a better understanding of how they are implemented.I Using the ‘pip freeze’ Command: We must run the ‘pip freeze’ command from within the command prompt terminal of our device in order to achieve our goal.To begin, we must first open the command prompt terminal and then type the ‘pip command’ into it, followed by the enter key, which completes the process.When we click the enter key, the pip installer will begin gathering a list of all of the Python modules that have been installed, and after a short period of time, it will display a list of all of the Python modules that have been installed as follows: This function can also be used if our system’s pip installer is of version 1.3 or above.If our system’s pip installer is of version 1.3 or higher, we can also use this method to receive a list of all the Python modules that have been installed.

    The ‘pip list’ command is entered into the command prompt terminal of our device in the same manner as in the previous technique, and the enter key is pressed.When we click the enter key, the pip installer will begin gathering a list of all of the Python modules that have been installed, and after a short period of time, it will display a list of all of the Python modules that have been installed as follows: In this case, we have changed the ‘pip list’ command to: ‘pip list- format=column’ in order to be able to obtain a list of all the Python modules that have been installed on our system in the column forms.

    Conclusion

    In this article, we learnt how critical it is to have a list of all the installed modules on our system, or on someone else’s system, and how to create such a list.After that, we learnt about all of the different methods for retrieving a list of all of the Python modules that have been installed on the system.We learnt about the many techniques for working with locally installed Python modules as well as with all Python modules installed on the system, and we practiced using these methods to better understand their implementation.

    How do I check if a package is installed on Debian and Ubuntu

    By following the instructions in this article, you will learn how to determine whether or not a package is installed on Debian-based Linux distributions, such as Ubuntu.

    Checking if a specific package is installed using dpkg:

    On Debian-based Linux distributions, you may use the dpkg command, followed by the -s (status) flag and the package name, to determine whether or not a given package is currently installed.Example of a dpkg command, which is used to verify the status of a package, is shown in the following section.According to what you can see, the command returns information on the package, which includes the following information: Package name: The name of the package.Package status: You may check the current status of a package on your system from this page.Priority: Packages can be assigned one of five different priority levels: The priority ‘Required’ is assigned to packages that are critical to the operation of the system; deleting packages with the ‘Required’ priority may result in the failure of the system.

    The second potential priority mode for an is the ‘Important’ priority mode, which is reserved for packages that are not required by the system but are required by the user, such as a text editor such as nano or net-tools.The third priority level is ‘Standard,’ which comprises packages that are set to be installed by default in the operating system.The fourth priority level is ‘Optional,’ which covers packages that are available in Debian/Ubuntu systems but are not required.Finally, the fifth priority is ‘Extra,’ which has been deprecated and has been replaced with ‘Optional.’ This is the highest possible priority.The status ‘Extra’ was assigned to packages that were highly specialized.The packages in this section are organized into categories; currently available categories include admin, database, cli-mono, debug, devel, doc, editors, education, gnustep, embedded, fonts, games, gnome, gnu-r, electronics, graphics, interpreters, hamradio, haskell, python, introspection, javascript, java, ruby, kde, lisp, mail, math, metapackages Dimensions when installed: You may see the projected amount of disk space required to install the software, expressed in bytes.

    Maintainer: The information about the package’s developer is displayed in this field.Architecture: You can see the package architecture in this section.Version refers to the package version.Dependencies between packages are referred to as dependencies.

    Description: This is a description of the package.Website for the Package/Developer is the homepage.The output seen in the screenshot below is when you run a check on a package that isn’t currently installed.You may also use the dpkg command in conjunction with the -l flag to determine the status of a given package, as illustrated in the example below.

    Checking if a specific package is installed using dpkg-query:

    Using the dpkg-query tool, you may determine whether or not a given package is currently installed on your system.You may do this by running dpkg-query, followed by the -l switch and the name of the package you wish to find out more information about.The following example demonstrates how to determine whether or not the Steam package has been installed.You may use the same command to display a list of all installed packages by omitting the package name, as demonstrated in the following illustration.

    Check if a package is installed using apt-cache:

    Among other things, the apt-cache program may provide information about packages, installed versions, and other things. In order to obtain this output, you must first include the policy option, followed by the package name, as demonstrated in the following example.

    Get a list of all installed packages using apt:

    To print a list of all installed packages on your system rather than testing if a specific package has been installed, you may use the apt command to accomplish this, as seen in the example below.

    Get a list of all installed packages reading logs:

    It is also common practice to examine the logs from the apt or dpkg packages in order to obtain a complete list of all installed packages.Run the following command to view the contents of the apt log.cat /var/log/apt/history.log /var/log/apt/history.log Run the command below to view the dpkg log and obtain information about the packages that have been installed.grep ″install ″ /var/log/dpkg.log /var/log/dpkg.log Instead of using the grep command, you may read compressed dpkg logs by using the zgrep command, as illustrated in the example below.zgrep ″ install ″ /var/log/dpkg.log.11.gz /var/log/dpkg.log.11.gz However, as you can see, compressed logs only provide partial information; however, you may use a wildcard (*) to read all compressed logs at the same time, as seen in the following example.

    zgrep ″ install ″ /var/log/dpkg.log.*.gz /var/log/dpkg.log.*.gz

    How to check upgraded and removed packages:

    Only information about upgraded packages will be displayed if you use the command below to do this.As previously taught, while working with installed packages, you may also check compressed logs for updated packages by using the wildcard, as seen in the following illustration.zgrep ″upgrade ″ /var/log/dpkg.log.*.gz /var/log/dpkg.log.gz If you wish to list packages that have been deleted, the procedure is the same; simply substitute the word ″upgrade″ with the word ″remove,″ as seen below.grep ″delete ″ /var/log/dpkg.log |grep ″remove ″

    Conclusion:

    Use the following command if you just want information about updated packages to be shown on your screen.As previously taught, while working with installed packages, you may also check compressed logs for updated packages by using the wildcard, as seen in the example below.The following command will upgrade the package logs: zgrep ″upgrade ″ /var/log/dpkg.*.gz Similarly, if you wish to see a list of packages that have been uninstalled, you may use the same procedure; simply substitute the word ″upgrade″ with the word ″remove.″ The following command searches for ″remove″ in the dpkg.log file in the var directory: grep ″remove ″.

    About the author

    David Adams is a System Administrator and writer who specializes in open source technologies, security software, and computer systems. He holds a bachelor’s degree in computer science.

    Solution

    My two cents on how to create a pip freeze-like list from a Python function are as follows: importing pip installed packages = pip.get installed distributions() installed packages list = sorted([″percent s == percent s″ percent (i.key, i.version) for I in installed packages]) import pip print(installed packages list) As a (far too lengthy) one-liner, I’ll say: sorted() Giving: The following variables are defined: [‘behave==1.2.4’, ‘enum34==1.0’, ‘flask==0.10.1’, ‘itsdangerous==0.24’, ‘jinja2==2.7.2’, ‘jsonschema==2.3.0′,’markupsafe==0.23’, ‘nose==1.3.3’, ‘parse==1.6.4’, ‘prettytable=

    Scope

    This method is applicable to either the system scope or the scope of a virtual environment, and it includes packages installed by setuptools, pip, and (oh no, not easy install) among other tools.

    My use case

    In my flask server, I stored the result of this call as a list of packages installed on the server’s virtualenv, so that whenever I call it, I receive the list of packages installed on the server’s virtualenv. It greatly simplifies the process of debugging.

    Caveats

    It has occurred to me that when the Python interpreter is launched in the same directory as a setup.py file, it does not show the packages that have been installed by setup.py. This is a weird behavior that I have observed.

    Steps to reproduce:

    Create a virtual environment in your computer.$ cd /tmp to the temporary directory test env is a virtual environment created with $ virtualenv A new python executable has been added to test env/bin/python.Setuptools are being installed, and pip has been completed.$ source test env/bin/activate (test env) $ target test env $ Create a git repository and run setup.py(test env) on it.git clone $ git clone Cloning into the state of ‘behave’ remote: Using the current pack: 4350, completed.

    4350 in total (delta 0), 0 re-used in the remote (delta 0) 100 percent (4350/4350), 1.85 MiB |418.00 KiB/s, completed.Receiving objects: 100% (4350/4350), 1.85 MiB |418.00 KiB/s, finished.Completed delta resolution (2388/2388): 100 percent (2388/238).Checking for network connectivity.

    done.We have the setup for how to act.py in the directory /tmp/behave: (test env) $ ls /tmp/behave/setup.py /tmp/behave/setup.py /tmp/behave/setup.py Install the python package from the git repo (test env) and restart your computer.Installing behave requires the following commands: $ cd /tmp/behave && pip install.

    I’ve installed the file /private/tmp/test env/lib/python2.7/site-packages/enum34-1.0-py2.7.egg in the /private/tmp/test env/lib/python2.7/site-packages/enum34-1.0-py2.7.egg directory.Processing dependencies for behave has been completed.==1.2.5a1

    If we run the aforementioned solution from /tmp

    Import pip, then sort(), then os.getcwd() ‘/private/tmp’, then os.exit(), then exit.

    If we run the aforementioned solution from /tmp/behave

    Pip >> sorted() >> import os >>> import os >>> The function os.getcwd() ‘/private/tmp/behave’ behave==1.2.5a1 is missing from the second example since the working directory contains the setup.py file for behave, which is absent from the first example. There was no mention of this problem in the documentation that I could discover. Perhaps I should file a bug report about it.

    How to List Python Packages – Globally Installed vs Locally Installed

    An application package that has been deployed globally becomes available to all users that log into the system.When using a Unix-based system, this implies that Python and all of its packages will be installed in a directory beneath the root of the system, or in the Program Files’ directory on a Windows-based system.When a package is installed locally, on the other hand, it is only accessible to the person who performed the installation.A directory comparable to /.local/bin/ for a Unix-based system, or UsersUsernameAppDataLocalPrograms for Windows, will be used to store the locally installed Python and all of its packages when they are downloaded and installed.For optimum results, install Python and the packages you require into a distinct virtual environment for each project, as recommended by the Python documentation.

    When this is done, an isolated environment is created, which eliminates many of the difficulties that might develop as a result of shared libraries and dependencies.The Pip Package Manager may be used to display a list of Python packages that have been installed both globally and locally.The Pipenv, Anaconda Navigator, and Conda package managers may all be used to display a list of locally installed packages in their respective contexts, in addition to the standard package manager.It is usually a good practice to check that the most recent versions of Python, Pip, Pipenv, Anaconda Navigator, and Conda are installed before listing packages.

    How to List Python Packages that are Globally Installed

    By default, Pip installs packages on a global level. Use the commands pip list or pip freeze to get a list of all globally installed packages and their versions. Depending on your operating system, the following command can be used to list a single globally installed package and its version: In Linux, you may use the commands pip freeze|grep Pip freezes on Windows | findstr

    How to List Python Packages that are Locally Installed

    Pip

    However, even though pip installs packages worldwide by default, packages that have been installed locally using the –user option can be listed using the same –user option, as seen in the following example: pip list -user or pip freeze -user are two options.In order to list a single, locally installed package and its version, you can use one of the following commands, which will vary according to your operating system: pip freeze -user |grep |grep |grep For Windows, execute the command pip freeze -user |

    findstr.

    Pipenv

    For example, in a pipenv environment, you may list locally installed packages and their versions by cding into the pipenv project and using the following command: lock pipenv using the -r switch This command will report all of the packages that have been installed, as well as any dependencies that have been discovered in a Pipfile.lock file.

    ActiveState Platform

    • To see a visual depiction of the packages in your local or virtual environment, you may utilize the ActiveState Platform’s Web-based graphical user interface (GUI), which displays the following: Top-level packages have been installed.
    • Package requirements have been installed.
    • Shared (i.e., system-wide) dependencies have been installed

    Conda

    When working in a Conda environment, you may use the following command to get a list of locally installed packages and their versions: Open the Anaconda Prompt and type the following command: conda list is an abbreviation for Conda List.

    Anaconda Navigator

    When working in a Conda environment, you may use the following command to display a list of locally installed packages and their versions: list of conda

    1. Within a Conda environment, launch the Anaconda Prompt and type the following command to see a list of locally installed packages and their versions: conda list is an abbreviation for conda list.

    How to Determine the Location of Globally Installed Packages

    Python packages that are installed worldwide, as previously stated, may often be located in the default installation directory for your operating system.It is possible to install packages in a location other than the usual installation directory.To find out where global packages have been installed, use the following command on your computer: python -m site python -m site Use the following script to display the location of globally installed packages in a Python console: >>> import site >>> print(site.getsitepackages())’ or >>> import sys >>> sys.path

    Using Pip Show for Package Location

    Globally installed Python packages, as previously stated, are usually located in your operating system’s default installation directory.Installation of packages in a directory other than the usual one is feasible.To find out where global packages have been installed, use the following command on your machine: Python -m site is a command that allows you to specify a location on the internet.The following script may be used to display the location of globally installed packages in a python console: >>> import site >>> print(site.getsitepackages())’ or >>> import site >>> print(site.path())’

    How to Determine the Location of Locally Installed Packages

    The following command may be used to provide a list of the locations of locally installed packages: using the python command line parameters site and user-site Using source code, the ActiveState Platform automatically generates all Python packages (including linked C libraries) and packages them for distribution on the Windows, Linux, and macOS platforms.The fact that it is entirely done on the server side eliminates the need for local build environments to be maintained.Sign up for a free ActiveState Platform account to give it a test drive first.

    From the terminal verify if python 3 is installed

    Simply type python3 -version into your terminal. If Python 3 is installed, you should receive some sort of output, such as Python 3.8.1.

    Shell script

    You may use the command or type builtins to accomplish this: commands-v python3 >/dev/null 2>&1 and echo commands-v Python 3 is now available for use.Type -P python3 >/dev/null 2>&1 && echo to execute a POSIX-compliant program.Python 3 is now available for use.Bash is the only option.Use of which is not encouraged since it involves the initiation of an external procedure, which might lead to inaccurate results under some circumstances.

    answered 20th of July, 2016 at 16:05 Eugene Yarmash’s full name is Eugene Yarmash.Eugene Yarmash has 129k36 gold badges, 296 silver badges, 357 bronze badges, and 129k36 platinum badges.0 the following command should be executed What is the exit status of the command $?and which python3 are you using?If the user has Python 3 installed, the value will be 0, otherwise it will be 1.answered 20th of July, 2016 at 16:03 1 If you wish to mute the error, you may want to route &>/dev/null like Eugene does above.

    Posted on May 17, 2018 at 17:20

    The output of ″python3 -V″ may be checked using a regular expression match on the output. As an illustration:] echo ″Python 3 has been successfully installed″ responded on July 18, 2019 at 21:03 Noam ManosNoam Manos12.3k2 gold badgesNoam Manos12.3k2 gold badges 76 silver badges are available. 73 bronze medals were awarded.

    How to Find Out if a Package is Installed on Linux or Not?

    Using the output of ″python3 -V,″ you may check whether or not it is true using a regular expression match. As an illustration: [ Answered on July 18, 2019 at 21:30: ″Python 3 has been installed.″ A total of 12.3k2 gold badges were earned by the player Noam Manos (Naom Manos). 76 badges in silver badges made of bronze (73 total)

    1) How to find out if a package is installed or not in Linux

    You may be aware that the installed package may be quickly discovered using the package manager provided by your Linux distribution. Although there are some Linux commands that are universally applicable, you may use them to validate package information regardless of which distribution you are using.

    1.a) Using which command

    When the ‘which’ command is put in the terminal, it produces an executable path that may be used to run the command when it is executed.The ‘which’ command searches just the directories listed in the current user’s PATH environment variable, not the directories included in the PATH environment variable for all users.In order to obtain a comprehensive list of VIM executable file locations, use the following command: If you have the VIM package installed on your machine, it will display the path to the package as seen below: where vi is found in the /usr/bin/vi directory

    1.b) Using whereis command

    When the ‘which’ command is put in the terminal, it produces an executable path that can be used to carry out the command.Because it looks only for folders that are listed in the current user’s PATH environment variable and not for all users, the ‘which’ command is not very useful.In order to obtain a comprehensive list of VIM executable file locations, use the following command: The following path will be displayed if the VIM package is installed on your computer: If the VIM package is installed on your computer, it will display the following path: where vi is located in the /usr/bin directory

    1.c) Using locate command

    It is faster to use the ‘locate’ command than the find command since it makes use of an updatedb database, whereas the find command looks for results in real time.It searches through a database rather than searching through individual directory paths to find a specific file.It is possible that the specified package binary or executable file is already installed on the system if the following output indicates the location of the given package binary or executable file.If this is not the case, the package is not installed on the computer.find -basename ‘nano’ /usr/bin/nano /usr/share/nano /usr/share/doc/nano /usr/share/doc/nano /usr/share/doc/nano

    2) How to find out whether a package is installed or not in Linux, using package manager

    When trying to determine if a package is installed or not in Linux, the official package managers of the distribution might be utilized.

    2.a) On Arch Linux

    The pacman command may be used to determine whether or not a certain package is installed on Arch Linux and its variants.As long as the ‘nano’ package is not present on the system, the command below will provide no results.Upon installation, the following name will be shown in the appropriate location: $ pacman -Qs nano local/nano 4.3-1 (base) Pico editor clone with improvements $ pacman -Qs nano local/nano 4.3-1

    2.b) On CentOS / Red Hat (RHEL) 6/7

    In Red Hat and its clones such as CentOS and Oracle Linux, the yum command or the rpm command may be used to detect if a certain package is installed or not.The yum command is used in the following situations: yum list has been installed openssh The following plugins are currently loaded: fastestmirror and universal-hooks.loading mirror speeds from cached hostfile * EA4: 203.174.85.202 * cpanel-addons-production-feed: 203.174.85.202 * cpanel-plugins: 203.174.85.202 * centos.netonboard.com as the starting point for the load * epel: mirror.airenetworks.es * extras: centos.netonboard.com * epel: mirror.airenetworks.es * nux-dextop: mirror.li.nux.ro * centos.netonboard.com * centos-dextop: centos.netonboard.com Packages that have been installed openssh.x86 [email protected] Using the rpm command: rpm -qa nano nano-2.3.1-10.el7.x86 64 nano-2.3.1-10.el7.x86 64

    2.c) On Fedora/CentOS 8/RHEL 8

    In Fedora and CentOS/RHEL 8 systems, the dnf command or the rpm command can be used to determine whether or not a package is installed.Using the dnf command: dnf list installed dnf list installed The most recent metadata expiration check was done 0:44:26 ago on Tuesday, June 9th, 22:52:44 UTC.Packages that have been installed are [email protected] following rpm command is used: rpm -qa nano

    2.d) On Ubuntu/Debian

    • This information may be obtained through the use of many commands available on Debian-based systems (such as Ubuntu, Linux Mint, and others), which are mentioned below: Commands: apt command, apt-cache command, Dpkg command, Dpkg-query command, apt-cache command

    If you are using a Debian-based system (such as Ubuntu, Linux Mint, or another similar distribution), you may use the following commands to obtain this information: Commands: apt command, apt-cache command, Dpkg command, Dpkg-query command, and so on.

    2.e) On openSUSE

    To determine whether a package is installed on openSUSE, use the zypper command or the rpm package manager.The following commands are used with the zypper command: zypper se -i nano $ zypper se -i nano The data from the repository is being loaded…Reading the packages that have been installed…S|Name|

    Summary|Type -+-+-+- i+ |nano|Pico editor clone with enhancements |package i+ |nano-lang |

    Translations for package nano|package i+ |nano-lang |translations for package nano|

    package i+ |nano-lang |translations for package nano|package i+ |

    nano-lang |translations for package nano|package i+ |

    nano-lang |translations for package nano|package i+ |nano The following rpm command is used: rpm -qa nano

    Closing Notes

    In this post, we’ve taught you how to use a variety of commands to determine whether a package is installed on your system. If you have any questions or would want to provide comments, please do so in the section below.

    Installing jq

    When using jq version 1.5 or 1.6, the Telco Cloud Operations deployment tool will work properly. JQ can be installed in one of two methods. The most favored method is to make use of yum. The option is to use the wget command. Both methods have been documented. Yum Installation is a term used to describe the process of putting together a meal from scratch (Recommended)

    Procedure

    1. Execute the following command and press y when prompted to confirm your actions. (If the installation is successful, you will see the message Complete!.) Installing JQ with $ yum install Changelo

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