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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}} |