Re: class error

[MRAB]

On 18/03/2011 20:13, monkeys paw wrote:

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?

You're importing the module "UserDict" and then trying to create a
subclass of it.

The module "UserDict" contains the class "UserDict".

You could write either:

    import UserDict

    class FileInfo(UserDict.UserDict):

or:

    from UserDict import UserDict

    class FileInfo(UserDict):
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