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Diffstat (limited to 'Doc/howto/functional.rst')
| -rw-r--r-- | Doc/howto/functional.rst | 13 |
1 files changed, 0 insertions, 13 deletions
diff --git a/Doc/howto/functional.rst b/Doc/howto/functional.rst index a81e5eb..faa0418 100644 --- a/Doc/howto/functional.rst +++ b/Doc/howto/functional.rst @@ -670,19 +670,6 @@ If the iterable returns no values at all, a :exc:`TypeError` exception is raised. If the initial value is supplied, it's used as a starting point and ``func(initial_value, A)`` is the first calculation. :: - -``reduce(func, iter, [initial_value])`` doesn't have a counterpart in the -:mod:`itertools` module because it cumulatively performs an operation on all the -iterable's elements and therefore can't be applied to infinite iterables. -``func`` must be a function that takes two elements and returns a single value. -:func:`reduce` takes the first two elements A and B returned by the iterator and -calculates ``func(A, B)``. It then requests the third element, C, calculates -``func(func(A, B), C)``, combines this result with the fourth element returned, -and continues until the iterable is exhausted. If the iterable returns no -values at all, a :exc:`TypeError` exception is raised. If the initial value is -supplied, it's used as a starting point and ``func(initial_value, A)`` is the -first calculation. - >>> import operator >>> reduce(operator.concat, ['A', 'BB', 'C']) 'ABBC' |