如何在 Python 中列出所有已安装的包及其版本?

问题描述

Is there a way in Python to list all installed packages and their versions?

I know I can go inside python/Lib/site-packages and see what files and directories exist, but I find this very awkward. What I'm looking for something that is similar to npm list i.e. npm-ls.

解决方案

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.