New submission from Gareth Rees:
The help text for the len() built-in function says:
Return the number of items of a sequence or mapping.
This omits to mention that len() works on sets too. I suggest this be changed
to:
Return the number of items of a sequence, mapping, or set.
Similarly, the documentation for len() says:
The argument may be a sequence (string, tuple or list) or a mapping
(dictionary).
I suggest this be changed to
The argument may be a sequence (string, tuple or list), a mapping
(dictionary), or a set.
(Of course, strictly speaking, len() accepts any object with a __len__ method,
but sequences, mappings and sets are the ones that are built-in to the Python
core, and so these are the ones it is important to mention in the help and the
documentation.)
----------
assignee: docs@python
components: Documentation
files: len-set.patch
keywords: patch
messages: 201019
nosy: Gareth.Rees, docs@python
priority: normal
severity: normal
status: open
title: Documentation for len() fails to mention that it works on sets
type: enhancement
Added file: http://bugs.python.org/file32313/len-set.patch
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