Raymond Hettinger added the comment:
The docs are correct as-is. This is a documented and tested behavior.
>>> from heapq import nsmallest
>>> list(nsmallest(3, ['larry', 'georg', 'raymond', 'guido', 'tim'],
key=len))
['tim', 'larry', 'georg']
The C implementation doesn't have a key-argument. That behavior gets added
downstream in pure python in Lib/heapq.py which wraps the C-function and adds
the additional behavior.
----------
assignee: -> rhettinger
nosy: +rhettinger
priority: low -> normal
resolution: -> invalid
status: open -> closed
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20407>
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