lmap.is_normal(k) yields True if k is a key in the given lazy map lmap that is neither lazy
        nor a formerly-lazy memoized key.

def is_normal(self, k):
        '''
        lmap.is_normal(k) yields True if k is a key in the given lazy map lmap that is neither lazy
        nor a formerly-lazy memoized key.
        '''
        v = ps.PMap.__getitem__(self, k)
        if not isinstance(v, (types.FunctionType, partial)) or [] != getargspec_py27like(v)[0]:
            return True
        else:
            return False