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Showing content from https://mail.python.org/pipermail/python-dev/2012-July/120979.html below:

[Python-Dev] PEP 0424: A method for exposing a length hint

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I've updated the PEP to reflect the discussion. There are two major changes:

1) NotImplemented may be used by __length_hint__ to indicate that there is no 
   finite length hint available.
2) callers of operator.length_hint() must provide their own default value, this
   is also required by the current C _PyObject_LengthHint implementation.

There are no provisions for infinite iterators, that is not within the scope of
this proposal.

Alex

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