[Python-ideas] Changing `Sequence.__contains__`

[Ram Rachum]

Why does the default `Sequence.__contains__` iterate through the items 
rather than use `.index`, which may sometimes be more efficient?

I suggest an implementation like this: 

    def __contains__(self, i):
        try: self.index(i)
        except ValueError: return False
        else: return True
        
What do you think? 
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