RIght now, reading a file from a ZipFile loads the
whole file into memory and returns it as a string. This
makes the module useless for large files.

My patch allows you to get a file-like object for each
entry in the zip, so you can do:

  f = z.readfile("largfile")
  print f.read(500)

Instead of the current method:

  s = z.read("largefile")
  print s[:500]

Much nicer if "largefile" is a 10MB file...


I added a function ZipFile.readfile, two classes for
the file-like objects (uncompressed and deflated), and
reimplemented ZipFile.read to use ZipFile.readfile. I
also added a small test to test_zipfile.py, although
some more extensive testing would be better, as usual.
I will be using this code in a project, which'll
provide additional testing.

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The test definately needs to be better, and documentation is
also required.

Postponing the patch pending an update.