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This change makes a difference in semantics (perhaps a good one) in this case:

import pprint

class MyDict(dict):
    def __repr__(self):
        return 'I do my own thing'*50


if __name__ == '__main__':
    d=MyDict()
    for i in range(50):
        d['a%s'%i] = i

    pprint.pprint(d)

Before the change MyDict.repr is ignored and the dict contents are printed. After the change it prints "I do my own thing" 50 times.

Since the original author has vanished, I'm going to close this and note that I did so on the bpo.