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| author | Armin Ronacher <armin.ronacher@active-4.com> | 2012-10-06 12:03:24 (GMT) |
|---|---|---|
| committer | Armin Ronacher <armin.ronacher@active-4.com> | 2012-10-06 12:03:24 (GMT) |
| commit | aa9a79d27958ae5afb6c8769a2b342d98677c091 (patch) | |
| tree | 24d49f530111a345c57f053a7f40652fa51d27a3 /Doc/library/operator.rst | |
| parent | ef08fb1f040cb51e752c6b1322008714262fbf3e (diff) | |
| download | cpython-aa9a79d27958ae5afb6c8769a2b342d98677c091.zip cpython-aa9a79d27958ae5afb6c8769a2b342d98677c091.tar.gz cpython-aa9a79d27958ae5afb6c8769a2b342d98677c091.tar.bz2 | |
Issue #16148: implemented PEP 424
Diffstat (limited to 'Doc/library/operator.rst')
| -rw-r--r-- | Doc/library/operator.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Doc/library/operator.rst b/Doc/library/operator.rst index 3860880..93f33ff 100644 --- a/Doc/library/operator.rst +++ b/Doc/library/operator.rst @@ -235,6 +235,12 @@ their character equivalents. .. XXX: find a better, readable, example +.. function:: length_hint(obj, default=0) + + Return an estimated length for the object *o*. First trying to return its + actual length, then an estimate using ``__length_hint__``, and finally + returning the default value. + The :mod:`operator` module also defines tools for generalized attribute and item lookups. These are useful for making fast field extractors as arguments for :func:`map`, :func:`sorted`, :meth:`itertools.groupby`, or other functions that |