On Sun, Mar 15, 2009, Michael Foord wrote: > > Note that using exceptions for control flow can be bad for other > implementations of Python. For example exceptions on the .NET framework > are very expensive. (Although there are workarounds such as not really > raising the exception - but they're ugly). > > Isn't it better practise for exceptions to be used for exceptional > circumstances rather than for control flow? It seems to me that we as a development community already made a decision when we switched to StopIteration as the primary mechanism for halting ``for`` loops. (Not that it was really a new decision because parts of the Python community have always advocated using exceptions for control flow, but the ``for`` loop enshrines it.) I doubt that using exceptions for control flow in ``with`` blocks will cause anywhere near so much a performance degradation. -- Aahz (aahz at pythoncraft.com) <*> http://www.pythoncraft.com/ Adopt A Process -- stop killing all your children!
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