Installing python module within code

Question

I need to install a package from PyPi straight within my script. Maybe there\'s some module or distutils (distribute, pip etc.) featur

Answer 1

for installing multiple packages, i am using a setup.py file with following code:

import sys
import subprocess
import pkg_resources

required = {'numpy','pandas','<etc>'} 
installed = {pkg.key for pkg in pkg_resources.working_set}
missing = required - installed


if missing:
    # implement pip as a subprocess:
    subprocess.check_call([sys.executable, '-m', 'pip', 'install',*missing])

Answer 2

You define the dependent module inside the setup.py of your own package with the "install_requires" option.

If your package needs to have some console script generated then you can use the "console_scripts" entry point in order to generate a wrapper script that will be placed within the 'bin' folder (e.g. of your virtualenv environment).

Answer 3

If you want to use pip to install required package and import it after installation, you can use this code:

def install_and_import(package):
    import importlib
    try:
        importlib.import_module(package)
    except ImportError:
        import pip
        pip.main(['install', package])
    finally:
        globals()[package] = importlib.import_module(package)


install_and_import('transliterate')

If you installed a package as a user you can encounter the problem that you cannot just import the package. See How to refresh sys.path? for additional information.

Answer 4

This should work:

import subprocess

def install(name):
    subprocess.call(['pip', 'install', name])

Answer 5

You can also use something like:

import pip

def install(package):
    if hasattr(pip, 'main'):
        pip.main(['install', package])
    else:
        pip._internal.main(['install', package])

# Example
if __name__ == '__main__':
    install('argh')

Answer 6

i added some exception handling to @Aaron's answer.

import subprocess
import sys

try:
    import pandas as pd
except ImportError:
    subprocess.check_call([sys.executable, "-m", "pip", "install", 'pandas'])
finally:
    import pandas as pd