[Python-ideas] Re: `is in`/`not is in` operators

[Jeremiah Vivian]

Something like this:
> \>\>\> class Movement:
> ...     def __eq__(self, x):
> ...         return type(x) is Movement
> ... 
> \>\>\> dummy = Movement()
> \>\>\> # suppose `bar` is a list of every recorded action in a game
> \>\>\> if dummy in bar:
> ...     if dummy is in bar: # check if the dummy value is in the actions
> ...         raise TypeError("cannot put dummy value in actions log")
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