fix(python): Handle PyPy python version correctly

[tyilo]

Description

Add support for parsing PyPy python version.

Motivation and Context

Before this fix, I get the following prompt:

... via 🐍 v3.7.9 (7e6e2bb30ac5fbdbd443619cae28c51d5c162a02, Nov 24 2020, 10:03:59)
[PyPy 7.3.3-beta0 with GCC 10.2.0]

With the fix:

... via 🐍 v3.7.9

How Has This Been Tested?

• I have tested using MacOS
• I have tested using Linux
• I have tested using Windows

Checklist:

• I have updated the documentation accordingly.
• I have updated the tests accordingly.

[tyilo]

Maybe the PyPy version should also be specified so that the output is 🐍 v3.7.9 (PyPy 7.3.3-beta0) instead of 🐍 v3.7.9?

[chipbuster]

Maybe the PyPy version should also be specified so that the output is 🐍 v3.7.9 (PyPy 7.3.3-beta0) instead of 🐍 v3.7.9?

I think this is fine as it is. The prompt already gets long enough without us trying to specify every single piece of version information--we can add a feature later to specify the exact python interpreter if needed, but that should probably be a separate feature PR.

[vladimyr]

@tyilo You did a fine job ensuring PyPy version gets correctly formatted applying minimal changes to the existing codebase but let's please improve the complete Python version extraction & formatting logic instead.

To help you with that here is a patch for you to apply: https://github.com/vladimyr/starship/commit/34b0302.patch (as seen here vladimyr@34b0302)

[vladimyr]

LGTM
Well done @tyilo!

[davidkna]

Thanks for the contribution @tyilo and thanks for reviewing @vladimyr.