confused about why i get a type error when i call an object's method

[pepper]

I'm confused about why i get a type error when i call an object's
method.  Here's the example code:
>>> class Foo:
        def __init__(self):
                self.foo = []
        def foo(self):
                print "in foo!"


>>> f = Foo()
>>> dir(f)
['__doc__', '__init__', '__module__', 'foo']
>>> f.foo()

Traceback (most recent call last):
  File "<pyshell#32>", line 1, in <module>
    f.foo()
TypeError: 'list' object is not callable
>>>

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