def __contains__(self, item):
keys = object.__getattribute__(self, "<STR_LIT>")<EOL>if item in keys:<EOL><INDENT>return True<EOL><DEDENT>return False<EOL>
Allows for the use of syntax similar to::

    if "blah" in model:

This only works with the internal _data, and does not include other
properties in the objects namepsace, simply due to the mess that would
create, and my lazyness.