[issue13430] Add a curry function to the functools module

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> However, here an example less confusional
> 
> >>> adder = curry(lambda (x, y): (x + y))
> >>> adder3 = adder(3)
> >>> adder3(4)
> 7
> >>> adder3(5)
> 8
> 
> Currying let you defining new functions on other functions.

But so does functools.partial. So the question is, what use case does it
help that functools.partial doesn't?

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<http://bugs.python.org/issue13430>
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