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Diffstat (limited to 'Doc/ref/ref3.tex')
| -rw-r--r-- | Doc/ref/ref3.tex | 7 |
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diff --git a/Doc/ref/ref3.tex b/Doc/ref/ref3.tex index 905a001..0222110 100644 --- a/Doc/ref/ref3.tex +++ b/Doc/ref/ref3.tex @@ -841,6 +841,13 @@ a list object, \code{x.__getitem__(i)} is not equivalent to operation raise an exception when no appropriate method is defined. \withsubitem{(mapping object method)}{\ttindex{__getitem__()}} +When implementing a class that emulates any built-in type, it is +important that the emulation only be implemented to the degree that it +makes sense for the object being modelled. For example, some +sequences may work well with retrieval of individual elements, but +extracting a slice may not make sense. (One example of this is the +\class{NodeList} interface in the W3C's Document Object Model.) + \subsection{Basic customization\label{customization}} |