def __init__ ( self, aFunc ):
        if not isinstance( aFunc, CallableTypes ):
            raise TraitError, "Argument must be callable."
        self.aFunc = aFunc
        self.fast_validate = ( 13, aFunc )
A docstring.
dataset/ETHPy150Open enthought/traits/traits/trait_handlers.py/TraitFunction.__init__--crossover with--dataset/ETHPy150Open ipython/ipython-py3k/IPython/core/tests/test_magic_arguments.py/magic_magic_foo