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Elaborate the explanation of different flavors of _* identifiers.

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Fixes SF bug #520325.
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Fred Drake 2003-09-06 03:50:07 +00:00
parent c0678ffc60
commit 38f6b8845b
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48
Doc/ref/ref2.tex
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@ -320,25 +320,39 @@ In some future version of Python, the identifiers \code{as} and
\subsection{Reserved classes of identifiers\label{id-classes}} \subsection{Reserved classes of identifiers\label{id-classes}}
Certain classes of identifiers (besides keywords) have special Certain classes of identifiers (besides keywords) have special
meanings. These are: meanings. These classes are identified by the patterns of leading and
trailing underscore characters:
\begin{tableiii}{l|l|l}{code}{Form}{Meaning}{Notes}
\lineiii{_*}{Not imported by \samp{from \var{module} import *}}{(1)}
\lineiii{__*__}{System-defined name}{}
\lineiii{__*}{Class-private name mangling}{}
\end{tableiii}
See sections: \ref{import}, ``The \keyword{import} statement'';
\ref{specialnames}, ``Special method names'';
\ref{atom-identifiers}, ``Identifiers (Names)''.
Note:
\begin{description} \begin{description}
\item[(1)] The special identifier \samp{_} is used in the interactive
interpreter to store the result of the last evaluation; it is stored \item[\code{_*}]
in the \module{__builtin__} module. When not in interactive mode, Not imported by \samp{from \var{module} import *}. The special
\samp{_} has no special meaning and is not defined. identifier \samp{_} is used in the interactive interpreter to store
the result of the last evaluation; it is stored in the
\module{__builtin__} module. When not in interactive mode, \samp{_}
has no special meaning and is not defined.
See section~\ref{import}, ``The \keyword{import} statement.''
\note{The name \samp{_} is often used in conjunction with
internationalization; refer to the documentation for the
\ulink{\module{gettext} module}{../lib/module-gettext.html} for more
information on this convention.}
\item[\code{__*__}]
System-defined names. These names are defined by the interpreter
and it's implementation (including the standard library);
applications should not expect to define additional names using this
convention. The set of names of this class defined by Python may be
extended in future versions.
See section~\ref{specialnames}, ``Special method names.''
\item[\code{__*}]
Class-private names. Names in this category, when used within the
context of a class definition, are re-written to use a mangled for
to help avoid name clashes between ``private'' attributes of base
and derived classes.
See section~\ref{atom-identifiers}, ``Identifiers (Names).''
\end{description} \end{description}