[issue19202] Additions to docs

[Esa Peuha]

Esa Peuha added the comment:

How would you give a single definition of reduce() that helps people to understand both 2-arg and 3-arg variants? The way it is implemented in C is impossible to duplicate in pure Python; the best you could do is a hack that works unless someone *tries* to break it, but that would just be confusing.

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<http://bugs.python.org/issue19202>
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