[issue15020] default value for progname in pythonrun.c should be python3 for Python 3

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

This sounds reasonable. Is there any reason that this change might be detrimental?

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nosy: +pitrou

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15020>
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