Re: [Python-Dev] Switch statement

[Raymond Hettinger]

The optimisation of the if-elif case would then simply be to say that the compiler can recognise if-elif chains like the one above where the RHS of the comparisons are all hashable literals and collapse them to switch statements. Right (constants are usually hashable :-). The LHS is more challenging.  Given:     if x == 1: p_one()     elif x == 2: p_two()     elif x == 3: p_three()     else: p_catchall() There is no guarantee that x is hashable.  For example:     class X:         def __init__(self, value):              self.value = value         def __cmp__(self, y):              return self.value == y     x = X(2) Raymond

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