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Update itertools docs (GH-15114) 

* Remove suggestion that is less relevant now that global lookups are much faster
* Add link for installing the recipes
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Raymond Hettinger 2019-08-04 13:35:58 -07:00 committed by GitHub
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Doc/library/itertools.rst
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@ -691,6 +691,12 @@ Itertools Recipes
This section shows recipes for creating an extended toolset using the existing
itertools as building blocks.
Substantially all of these recipes and many, many others can be installed from
the `more-itertools project <https://pypi.org/project/more-itertools/>`_ found
on the Python Package Index::
pip install more-itertools
The extended tools offer the same high performance as the underlying toolset.
The superior memory performance is kept by processing elements one at a time
rather than bringing the whole iterable into memory all at once. Code volume is
@ -913,9 +919,3 @@ which incur interpreter overhead.
result.append(pool[-1-n])
return tuple(result)
Note, many of the above recipes can be optimized by replacing global lookups
with local variables defined as default values. For example, the
*dotproduct* recipe can be written as::
def dotproduct(vec1, vec2, sum=sum, map=map, mul=operator.mul):
return sum(map(mul, vec1, vec2))