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])



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 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.

How to check if a module or a package is already installed in python3?, Not every package manager is pip compatible when dealing with namespace checking if the pandas package is installed if python -c 'import pkgutil; exit(not Works in python2 and python3, and then you install based on the exit code. The Python extension for VS Code from the Visual Studio Marketplace. For additional details on installing extensions, see Extension Marketplace. The Python extension is named Python and published by Microsoft. Miniconda with Python 3.7. Note: If you already have the full Anaconda distribution installed, you don't need to install Miniconda

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']:
        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'])

How to check if a python module exists without importing it?, To check if you can import something in Python 2, you can use imp How to check if a table exists in MySQL and create if it does not You can also use iter_modules from the pkgutil module to iterate over all modules to find if specified module exists. This is because this module is installed on my PC. Note: By default, the Python extension looks for and uses on the first Python interpreter it finds in the system path. If it doesn't find an interpreter, it issues a warning. On macOS, the extension also issues a warning if you're using the OS-installed Python interpreter, because you typically want to use an interpreter you install directly.

How to Install a Package in Python using PIP, If you're using Windows, you'll be able to install a Python package by Don't worry if you don't know what it means, as in the next section, I'll cover within the Python application folder, where you originally installed Python. Now I'll share with you the code to install/uninstall Python packages using a simple tool I created. The problem is that PyCharm seems to default to not importing module class paths, which requires two separate fixes to correct. Step 1. Right click on the module name, and mark it as "Source": Step 2. For some reason, by default in PyCharm, it does not actually add directories marked as "Sources Root" to the Python path. Fix this by switching

Python Module Index — Python 3.8.5 documentation, _ | a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p | q | r | s | t | u | v | w | x | z distutils , Support for building and installing Python modules into an existing Python installation. distutils.archive_util doctest, Test pieces of code within docstrings. Installing Packages¶. This section covers the basics of how to install Python packages.. It’s important to note that the term “package” in this context is being used as a synonym for a distribution (i.e. a bundle of software to be installed), not to refer to the kind of package that you import in your Python source code (i.e. a container of modules).

Installing Packages — Python Packaging User Guide, package that you import in your Python source code (i.e. a container of modules). See the Python for Beginners getting started tutorial for an introduction to using your Do not run any of the commands in this tutorial with sudo : if you get a Additionally, it will install setuptools and wheel if they're not installed already. I have python installed and I have pythonPath set, but whenever I open a python project folder I get this popup I get the poput even though I already opened this project previously in VSCode.

  • 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:…
  • @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