# _functools - pydoc - phpman

Help on built-in module _functools:

## NAME
    _functools - Tools that operate on functions.

## FUNCTIONS
### cmp_to_key
        Convert a cmp= function into a key= function.

### reduce
        reduce(function, iterable[, initial]) -> value

        Apply a function of two arguments cumulatively to the items of a sequence
        or iterable, from left to right, so as to reduce the iterable to a single
        value.  For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5]) calculates
        ((((1+2)+3)+4)+5).  If initial is present, it is placed before the items
        of the iterable in the calculation, and serves as a default when the
        iterable is empty.

## FILE
    (built-in)