[issue1739648] zipfile.testzip() using progressive file reads

[Alan McIntyre]

Alan McIntyre added the comment:

This sort of change definitely needs to be made to avoid reading huge
files into memory for testzip().  I've attached a modified patch as
zipfile_testzip_amcintyre.diff; it didn't seem appropriate to have a
module-level variable for the size of the test read, and I made a few
other minor tweaks.

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nosy: +alanmcintyre
Added file: http://bugs.python.org/file9057/zipfile_testzip_amcintyre.diff

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