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Message: [QUOTE="Alf P. Steinbach, post: 4017425"] * Anthony Tolle: As far as I understand it the behavior stems from CPython file operations being implemented fairly directly as forwarding to C library FILE* operations, and the C standard prescribes Undefined Behavior to the case above. I think the Python language/library specification should specify the effect (perhaps just as UB, but anyway, specified). For as it is, it may/will be different with different Python implementations, meaning that code that works OK with one implementation may fail with another implementation. Cheers, - Alf [/QUOTE]