[Python-ideas] hook zipfile.ZipExtFile to check secure hash sums

[Daniel Holth]

I am checking the sha256 sums of all the files in a zip archive as it
is being extracted by overriding ZipExtFile._update_crc, but it is
inconvenient.

It would be nice to have a hook, for example the ZipExtFile
constructor could be a property of ZipFile and conveniently replaced
with a ZipExtFile subclass.