class A:
    def f(self):
        self.x = "f"
    def say(self):
        print self.x

a = A()
# a.f()
# a.say()
print a.__class__.__dict__.keys()

class A:
    def g(self):
        self.x = "g"
a = A()
print a.__class__.__dict__.keys()
# a.g()
# a.say()

## output
['__module__', '__doc__', 'say', 'f']
['__module__', '__doc__', 'g']