Benjamin Gilbert added the comment:

Here are the cases where close() will generate a ZIP64 archive and an exception 
will never be raised:

1. There are more than 65535 files in the archive.

2. The start of the central directory is at > 2 GB.

3. The central directory size is > 2 GB.

#1 could be checked from write/writestr.  #2 could possibly be checked from 
write/writestr by looking at the file offset after writing the compressed data. 
 #3 cannot be checked until close, but I'm not sure if it can ever occur 
without triggering one of the other checks first.

----------
status: pending -> open

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21866>
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