Clarify os.strerror()s exception behavior.
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@ -285,7 +285,8 @@ process and user.
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.. function:: strerror(code)
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.. function:: strerror(code)
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Return the error message corresponding to the error code in *code*.
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Return the error message corresponding to the error code in *code*.
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Availability: Unix, Windows.
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On platforms where :cfunc:`strerror` returns ``NULL`` when given an unknown
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error number, :exc:`ValueError` is raised. Availability: Unix, Windows.
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.. function:: umask(mask)
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.. function:: umask(mask)
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