[issue18805] ipaddress netmask/hostmask parsing bugs

[Nick Coghlan]

Nick Coghlan added the comment:

Attaching my patch for reference (although I just realised I need to tweak the NEWS entry slightly to indicate that valid prefixes that were previously rejected are now accepted).

Sorry we weren't able to make use of your patch Jon, but thanks for the detailed description of the parsing problems!

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Added file: http://bugs.python.org/file33994/issue18805_standard_library.diff

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