[issue5061] Inadequate documentation of the built-in function open

[David W. Lambert]

David W. Lambert <lambertdw at corning.com> added the comment:

(prospective, not perspective programmer)

Spelling out the possibilities as suggested in Message80563 makes better
sense to me than writing in words the logic handling the mode argument
of the io.open function.  (Perhaps there is a clearer implementation
using a dictionary with frozenset keys, but the io module for py3k is
being recast in c, per my understanding.)

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<http://bugs.python.org/issue5061>
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