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Issue 7447: Improve docs for sum().

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Raymond Hettinger 2010-10-31 21:28:53 +00:00
parent 490986308e
commit 15c2cec4fd
1 changed files with 7 additions and 4 deletions
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Doc/library/functions.rst
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@ -1227,10 +1227,13 @@ available. They are listed here in alphabetical order.
Sums *start* and the items of an *iterable* from left to right and returns the Sums *start* and the items of an *iterable* from left to right and returns the
total. *start* defaults to ``0``. The *iterable*'s items are normally numbers, total. *start* defaults to ``0``. The *iterable*'s items are normally numbers,
and are not allowed to be strings. The fast, correct way to concatenate a and the start value is not allowed to be a string.
sequence of strings is by calling ``''.join(sequence)``. Note that
``sum(range(n), m)`` is equivalent to ``reduce(operator.add, range(n), m)`` For some use cases, there a good alternatives to :func:`sum`.
To add floating point values with extended precision, see :func:`math.fsum`\. The preferred, fast way to concatenate a sequence of strings is by calling
``''.join(sequence)``. To add floating point values with extended precision,
see :func:`math.fsum`\. To concatenate a series of iterables, consider using
:func:`itertools.chain`.
.. versionadded:: 2.3 .. versionadded:: 2.3