Thomas Kluyver added the comment:
1. For the cases like read/write handles conflicting, ValueError doesn't seem
quite right to me - I take ValueError to mean that you have passed an invalid
value to a function. RuntimeError feels like the closest fit for 'the current
state does not allow this operation'. It is rather broad, though.
If I was writing it anew, I would use ValueError for something like an invalid
mode parameter: zf.open('foo', mode='q') . That particular case was already in
the code, though, so I think backwards compatibility should take precedence.
2 & 3. Agreed, I'll prepare a patch
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<http://bugs.python.org/issue26039>
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