Python's Inner function getattr questions?

gistfile1.py

class Foo:
    def getattr(self, arg):
        def x():
            return "good"
        return getattr(self, arg, None)

    def x(self):
        return "bad"

f = Foo()
print f.getattr("x")() # => bad


class Bar:
    def getattr(self, arg):
        def x():
            return "good"
        if arg in locals():
            return locals()[arg]
        else:
            raise

    def x(self):
        return "bad"

b = Bar()
print b.getattr("x")() # => good