[issue1739468] Add a -z interpreter flag to execute a zip file

[Guido van Rossum]

Guido van Rossum added the comment:

PJE's patch looks good to me too.

Stylistic nits:

- The proper name of the now-public null importer type ought to be
PyNullImporter_Type, to rhyme with e.g. PyString_Type

- There's a multi-line if that has the closing parenthesis in an odd
place at the start of the next line. The preferred style is to place the
close paren after the last condition, and put the open curly on a line
by itself.

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nosy: +gvanrossum

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<http://bugs.python.org/issue1739468>
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