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| author | Fred Drake <fdrake@acm.org> | 2000-09-19 18:21:25 (GMT) |
|---|---|---|
| committer | Fred Drake <fdrake@acm.org> | 2000-09-19 18:21:25 (GMT) |
| commit | 8d27f898b2a601039859cc12e105f567e5d0e946 (patch) | |
| tree | 49b41663eb787ce6605c25774cf16eb4f4414229 /Doc | |
| parent | 1156f623483b1c49c1262b8e28a7ac1279e5ba4e (diff) | |
| download | cpython-8d27f898b2a601039859cc12e105f567e5d0e946.zip cpython-8d27f898b2a601039859cc12e105f567e5d0e946.tar.gz cpython-8d27f898b2a601039859cc12e105f567e5d0e946.tar.bz2 | |
Moshe Zadka <mzadka@geocities.com>:
Document the __contains__() method.
(Patch slightly modified by FLD.)
This closes SourceForge patch #101387.
Diffstat (limited to 'Doc')
| -rw-r--r-- | Doc/ref/ref3.tex | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Doc/ref/ref3.tex b/Doc/ref/ref3.tex index 1b07296..53e919f 100644 --- a/Doc/ref/ref3.tex +++ b/Doc/ref/ref3.tex @@ -1172,6 +1172,16 @@ involving extended slice notation, or in absence of the slice methods, \method{__getitem__()}, \method{__setitem__()} or \method{__delitem__()} is called with a slice object as argument. +The membership test operators (\keyword{in} and \keyword{not in}) are +normally implemented as iteration loop through the sequence. However, +sequence objects can supply the following special method with a more +efficient implementation: + +\begin{methoddesc}[sequence object]{__contains__}{self, item} +Called to implement membership test operators. Should return true if +\var{item} is in \var{self}, false otherwise. +\end{methoddesc} + \subsection{Emulating numeric types\label{numeric-types}} |