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In Python 2.3, writestr() has an enhanced signature: the
first arg may now also be an archive name, in which case the
correct default settings are used (ie. the compression value
is taken from the file). See patch #651621.

extract() could be moderately useful (although I don't
understand the 'arcname' arg, how's that different from
'name'?) but would have to deal with file modes (bin/text).
The file mode isn't in the archive so would have to
(optionally) be supplied by the caller.