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Add usage note.

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Raymond Hettinger 2012-06-04 00:32:15 -07:00
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Doc/library/functools.rst
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@ -49,8 +49,9 @@ The :mod:`functools` module defines the following functions:
Since a dictionary is used to cache results, the positional and keyword Since a dictionary is used to cache results, the positional and keyword
arguments to the function must be hashable. arguments to the function must be hashable.
If *maxsize* is set to None, the LRU feature is disabled and the cache If *maxsize* is set to None, the LRU feature is disabled and the cache can
can grow without bound. grow without bound. The LRU feature performs best when *maxsize* is a
power-of-two.
If *typed* is set to True, function arguments of different types will be If *typed* is set to True, function arguments of different types will be
cached separately. For example, ``f(3)`` and ``f(3.0)`` will be treated cached separately. For example, ``f(3)`` and ``f(3.0)`` will be treated