[issue40651] class:`OrderedDict` Examples: LRU implementation has a bug.

[Dongfang Qu]

Dongfang Qu <qudongfang at gmail.com> added the comment:

Document of `collections`.
https://docs.python.org/3/library/collections.html

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40651>
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