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The pydoc documentation for filter reads:
 filter(function or None, sequence) -> list, tuple, or string
 
 Return those items of sequence for which function(item) is true. If
 function is None, return the items that are true. If sequence is a tuple
 or string, return the same type, else return a list.
It would be nicer to know (e.g. when offline and with no local access to the HTML documentation) that filter() can actually be used more generally with an iterable:
 filter(function or None, **iterable**) -> list, tuple, or string
 
 Return those items of **iterable** for which...

It was fixed in Python 3, and it is too late for 2.7.