[issue9811] strftime strips '%' from unknown format codes on OS X

[Santoso Wijaya]

Santoso Wijaya <santoso.wijaya at gmail.com> added the comment:

`strftime` does not, indeed, seem to define what behaviour it is supposed to do when given non-supported format characters. Under Windows, in fact, it will crash the runtime (see: issue #10762).

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nosy: +santa4nt

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<http://bugs.python.org/issue9811>
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