[pypy-commit] pypy default: Document __len__/__length_hint__.
arigo
noreply at buildbot.pypy.org
Thu Jun 7 11:19:05 CEST 2012
Author: Armin Rigo <arigo at tunes.org>
Branch:
Changeset: r55458:5c7fa43f9bb6
Date: 2012-06-07 11:18 +0200
http://bitbucket.org/pypy/pypy/changeset/5c7fa43f9bb6/
Log: Document __len__/__length_hint__.
diff --git a/pypy/doc/cpython_differences.rst b/pypy/doc/cpython_differences.rst
--- a/pypy/doc/cpython_differences.rst
+++ b/pypy/doc/cpython_differences.rst
@@ -324,5 +324,10 @@
type and vice versa. For builtin types, a dictionary will be returned that
cannot be changed (but still looks and behaves like a normal dictionary).
+* the ``__len__`` or ``__length_hint__`` special methods are sometimes
+ called by CPython to get a length estimate to preallocate internal arrays.
+ So far, PyPy never calls ``__len__`` for this purpose, and never calls
+ ``__length_hint__`` at all.
+
.. include:: _ref.txt
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