Add colour to Python help

[hugovk]

Feature or enhancement

Proposal:

python --help (and especially --help-all) is a monochrome wall of text. Similar to argparse help, let's add some colour to add structure and improve readability.

Here's real screenshots of --help and termshot capture of --help-all:

Before	After
--help	--help
--help-all	--help-all

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

• gh-148766: Add colour to Python help #148767

[serhiy-storchaka]

Suggestions:

• Show file and arg in the same color as option arguments.
• Why use different colors for short and long options? I would use the same color (different from the color for environment variables).
• There are references to options and environment variables in descriptions. I would highlight them too.

[hugovk]

Suggestions:

• Show file and arg in the same color as option arguments.

I followed what argparse does, see the positional argument product here:

• Why use different colors for short and long options? I would use the same color (different from the color for environment variables).

Also for consistency with argparse.

• There are references to options and environment variables in descriptions. I would highlight them too.

👍 Will check this tomorrow.