[issue32101] Add PYTHONDEVMODE=1 to enable the developer mode

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

While implementing a new PYTHONDEVMODE environment variable, I found that it would help to also add a new sys.flags.dev_mode flag. So I added it.

So for example, asyncio uses sys.flags.dev_mode rather than checking for 'dev' in sys._xoptions *and* check if the environment variable is set or not.

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