How to derive a class from md5?

[Josef Wolf]

Hello!

I'd like to create a class to calculate md5's of a file.  So I thought, I'd
derive from the md5 class.  I came up with following code:

  #!/usr/bin/python

  import md5

  class md5file(md5):
      def __init__(self, filename):
          md5.__init__(self)
          f=file(filename,"r")
          for l in f:
              self.update(l)
          f.close()

  print md5file("/etc/passwd").hexdigest()

But running this gives me the following error:

  Traceback (most recent call last):
    File "py/t.py", line 5, in ?
      class md5file(md5):
  TypeError: function takes at most 2 arguments (3 given)

dir(md5) shows that md5 don't have an __init__() method so I tried to use
its new(), with the same result.  What am I doing wrong here?

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