How to check if a module is installed in Python and, if not, install it within the code?

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I would like to install the modules 'mutagen' and 'gTTS' for my code, but I want to have it so it will install the modules on every computer that doesn't have them, but it won't try to install them if they're already installed. I currently have:

def install(package):
    pip.main(['install', package])

install('mutagen')

install('gTTS')

from gtts import gTTS
from mutagen.mp3 import MP3

However, if you already have the modules, this will just add unnecessary clutter to the start of the program whenever you open it.

EDIT - 2020/02/03

The pip module has updated quite a lot since the time I posted this answer. I've updated the snippet with the proper way to install a missing dependency, which is to use subprocess and pkg_resources, and not pip.

To hide the output, you can redirect the subprocess output to devnull:

import sys
import subprocess
import pkg_resources

required = {'mutagen', 'gTTS'}
installed = {pkg.key for pkg in pkg_resources.working_set}
missing = required - installed

if missing:
    python = sys.executable
    subprocess.check_call([python, '-m', 'pip', 'install', *missing], stdout=subprocess.DEVNULL)

Like @zwer mentioned, the above works, although it is not seen as a proper way of packaging your project. To look at this in better depth, read the the page How to package a Python App.

how to properly check if a module is installed, and if not attempt to , The packaging aspect seems to include imported modules with your code. package the entire virtual environment with your project as a unit, or; write a command line before running the program with python script_name.py ) script fail if the required dependencies aren't there, and have the user install� Do you want to know all the Python version installed on your system? The main strength of the Python is, the wide range of external libraries are available. As we keep coding in Python, we install many packages. It is easy getting a Python list installed modules on the system. There are a couple of ways you can do that.

pip list | grep <module_name_you_want_to_check>

Above is the answer, where:

pip list

list all modules, and

grep <module_name_you_want_to_check>

find the keyword from the list. Works for me.

How do I check whether a module is installed in Python, and install it , On ubuntu: sudo apt-get install python-pip , if it's not already installed. And both will show you all modules installed and their versions. Show activity on this post. You could put the code inside try , except block. If you want to know the version of a module within a Python script, you can use the __version__ attribute of the module to get it. Note that not all modules come with a __version__ attribute. For example,

Another solution it to put an import statement for whatever you're trying to import into a try/except block, so if it works it's installed, but if not it'll throw the exception and you can run the command to install it.

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You can use the command line :

python -m MyModule

it will say if the module exists

Else you can simply use the best practice :

pip freeze > requirements.txt

That will put the modules you've on you python installation in a file

and :

pip install -r requirements.txt

to load them

It will automatically you purposes

Have fun

Check the version of Python package / library, Get the version in Python script: __version__ attribute Check with pip commandList installed packages: pip listList installed packages: p. Note that __ version__ is not set for the standard library modules such as math and os . If you save the output in freeze format as a text file, you can install packages in� Some computer operating systems have Python version 2.7 installed “out of the box” (meaning, pre-installed). You can check whether Python by opening the command line terminal on your computer. Once the terminal is open, enter the following command and press “Enter” (or “Return”) on your keyboard:

You can check if a package is installed using pkg_resources.get_distribution:

import pkg_resources

for package in ['mutagen', 'gTTS']:
    try:
        dist = pkg_resources.get_distribution(package)
        print('{} ({}) is installed'.format(dist.key, dist.version))
    except pkg_resources.DistributionNotFound:
        print('{} is NOT installed'.format(package))

Note: You should not be directly importing the pip module as it is an unsupported use-case of the pip command.

The recommended way of using pip from your program is to execute it using subprocess:

subprocess.check_call([sys.executable, '-m', 'pip', 'install', 'my_package'])

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Comments
  • do you want a python script to run commands that execute the installation check and installation? or can you just execute shell commands on all these "computers"?
  • While you can technically force module installation from within your script, do not do that, it's a bad practice and people will inevitably hate you if you do it. Instead, learn how to properly package & distribute your Python application: digitalocean.com/community/tutorials/…
  • @zwer Is correct. Don't do this. If your package has dependences, let pip handle that.
  • Possible duplicate: Check if Python Package is installed
  • This works very well, but it gives the output of "requirement already satisfied", adding unnecessary clutter to the start of the code when you open it. Is there anyway to make it so it doesn't echo the "requirement already satisfied"?
  • Please add a disclaimer that a kitten dies whenever somebody uses import pip in their code as a workaround for proper packaging. -_-
  • @TheGirrafish Sorry, I meant that the list is comprised of "EggInfoDistribution" (and also DistINfoDistribution") which are part of the pip library. For example in my case, the first item in the list is "xmltodict 0.10.2", but "xmltodict 0.10.2" in pip.get_installed_distributions() returns False while "xmltodict 0.10.2" in str(pip.get_installed_distributions()) returns True
  • @dcoles Thanks for bringing this up, I've changed the code snippet to use subprocess over pip.
  • Also rather than using than redirecting sys.stdout, I'd recommend just using subprocess.check_call(args, stdout=subprocess.DEVNULL) to ignore pip's stdout.
  • please add some sescription and not only a code block