[issue9583] Document startup option/environment interaction

[Buck Golemon]

Buck Golemon <buck.golemon at amd.com> added the comment:

The file is here:
   http://svn.python.org/view/python/trunk/Python/pythonrun.c?view=markup

The second if statement is doing exactly what I find troubling: set the flag even if the incoming value is 0.
I guess this is to handle the empty string case, such as:

setenv PYTHONDEBUG
./myscript.py

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