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Clarify that the bool instances are acceptable return values from 

__nonzero__(), in response to SF bug #579991.
This commit is contained in:
Fred Drake 2002-08-07 15:40:15 +00:00
parent 2863c10a86
commit 442c7c7743
1 changed files with 5 additions and 4 deletions
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9
Doc/lib/libstdtypes.tex
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@ -33,10 +33,10 @@ The following values are considered false:
\begin{itemize}
\item \code{None}
\withsubitem{(Built-in object)}{\ttindex{None}}
\withsubitem{(Built-in object)}{\ttindex{None}}
\item \code{False}
\withsubitem{(Built-in object)}{\ttindex{False}}
\withsubitem{(Built-in object)}{\ttindex{False}}
\item zero of any numeric type, for example, \code{0}, \code{0L},
\code{0.0}, \code{0j}.
@ -46,8 +46,9 @@ The following values are considered false:
\item any empty mapping, for example, \code{\{\}}.
\item instances of user-defined classes, if the class defines a
\method{__nonzero__()} or \method{__len__()} method, when that
method returns the integer zero.\footnote{Additional
\method{__nonzero__()} or \method{__len__()} method, when that
method returns the integer zero or \class{bool} value
\code{False}.\footnote{Additional
information on these special methods may be found in the
\citetitle[../ref/ref.html]{Python Reference Manual}.}