languages/cpython
languages/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython synced 2024-09-16 00:48:28 +00:00
Code Issues Packages Projects Releases Wiki Activity

Fix duplicated paragraph.

Browse source
This commit is contained in:
Georg Brandl 2008-03-25 15:33:31 +00:00
parent cc47b05fe5
commit 545d300be0
1 changed files with 0 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

13
Doc/howto/functional.rst
View file

@ -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'