class error

[monkeys paw]

I have the following file:

FileInfo.py:

import UserDict

class FileInfo(UserDict):
        "store file metadata"
        def __init__(self, filename=None):
                UserDict.__init__(self)
                self["name"] = filename



When i import it like so:

import FileInfo


i get this error:

Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
  File "FileInfo.py", line 3, in <module>
    class FileInfo(UserDict):
TypeError: Error when calling the metaclass bases
    module.__init__() takes at most 2 arguments (3 given)

What is causing the error?
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