CODEWITHSUNDEEP
pythonpip
Nico Schlömer
Nico Schlömer

Reputation: 58921

Checking if a package is installed specifically via pip

Checking if a particular package is available from within Python can be done via

try:
    import requests
except ImportError:
    available = False
else: 
    available = True

Additionally, I would like to know if the respective package has been installed with pip (and can hence been updated with pip install -U package_name).

Any hints?

Upvotes: 2

Views: 10349

Answers (2)

sinoroc
sinoroc

Reputation: 22453

I believe one way to figure out if a project has been installed by pip is by looking at the content of the INSTALLER text file in the distribution's dist-info directory for this project. With pkg_resources from setuptools this can be done programmatically like the following (error checking omitted):

import pkg_resources

pkg_resources.get_distribution('requests').get_metadata('INSTALLER')

This would return pip\n, in case requests was indeed installed by pip.

Upvotes: 2

Nils Werner
Nils Werner

Reputation: 36849

You said subprocess.call() is allowed, so

available = not(subprocess.call(["pip", "show", "requests"]))

Upvotes: 0

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