>>> [] in a
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: list objects are unhashable
>>>
imo, the _expression_ should just evaluate to False instead of raising an exception.
it's a question of semantics -- i asked whether the object (a list, in this case)
is contained in the dict. i didn't ask whether it's hashable or not. if the object is
unhashable, then surely it's not contained in the dict, therefore the answer is
False, rather than an exception.
dict.__contains__ should just swallow these exceptions, and return False.
-tomer
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