How to list all installed packages and their versions in Python?

If you have pip install and you want to see what packages have been installed with your installer tools you can simply call this:

pip freeze

It will also include version numbers for the installed packages.

Update

pip has been updated to also produce the same output as pip freeze by calling:

pip list

Note

The output from pip list is formatted differently, so if you have some shell script that parses the output (maybe to grab the version number) of freeze and want to change your script to call list, you'll need to change your parsing code.

help('modules') should do it for you.

in IPython :

In [1]: import                      #import press-TABDisplay all 631 possibilities? (y or n)ANSI                   audiodev               markupbaseAptUrl                 audioop                markupsafeArgImagePlugin         avahi                  marshalBaseHTTPServer         axi                    mathBastion                base64                 md5BdfFontFile            bdb                    mhlibBmpImagePlugin         binascii               mimetoolsBufrStubImagePlugin    binhex                 mimetypesCDDB                   bisect                 mimifyCDROM                  bonobo                 mmapCGIHTTPServer          brlapi                 mmkeysCanvas                 bsddb                  modulefinderCommandNotFound        butterfly              multifileConfigParser           bz2                    multiprocessingContainerIO            cPickle                musicbrainz2Cookie                 cProfile               mutagenCrypto                 cStringIO              mutexCurImagePlugin         cairo                  mxDLFCN                  calendar               netrcDcxImagePlugin         cdrom                  newDialog                 cgi                    nisDiscID                 cgitb                  nntplibDistUpgrade            checkbox               ntpath

If you want to get information about your installed python distributions and don't want to use your cmd console or terminal for it, but rather through python code, you can use the following code (tested with python 3.4):

import pip #needed to use the pip functionsfor i in pip.get_installed_distributions(local_only=True):    print(i)

The pip.get_installed_distributions(local_only=True) function-call returns an iterable and because of the for-loop and the print function the elements contained in the iterable are printed out separated by new line characters (\n).The result will (depending on your installed distributions) look something like this:

cycler 0.9.0decorator 4.0.4ipykernel 4.1.0ipython 4.0.0ipython-genutils 0.1.0ipywidgets 4.0.3Jinja2 2.8jsonschema 2.5.1jupyter 1.0.0jupyter-client 4.1.1#... and so on...