result:
isinstance(x,X)
False
type(x) is X
False
<type 'list'>
list
I think you need to show us more of your code. Your variable, v, is not of type X in this example. Instead, it is of type list. What is self.mem.items()? It isn't a dictionary like your comment seems to imply, or you would get a TypeError on that line because dictionaries aren't callable.
Please give us enough sample code that we can actually run it and see what you're seeing.
--
Jerry
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