\item instances of user-defined classes, if the class defines a
\method{__nonzero__()} or \method{__len__()} method, when that
method returns zero.\footnote{Additional information on these
-special methods may be found in the \emph{Python Reference Manual}.}
+special methods may be found in the \citetitle[../ref/ref.html]{Python
+Reference Manual}.}
\end{itemize}
Instances of a class normally compare as non-equal unless the class
\withsubitem{(instance method)}{\ttindex{__cmp__()}}
-defines the \method{__cmp__()} method. Refer to the \emph{Python
-Reference Manual} for information on the use of this method to effect
-object comparisons.
+defines the \method{__cmp__()} method. Refer to the
+\citetitle[../ref/customization.html]{Python Reference Manual} for
+information on the use of this method to effect object comparisons.
\strong{Implementation note:} Objects of different types except
numbers are ordered by their type names; objects of the same types
before another value when using the \keyword{print} statement.
Classes that are trying to simulate a file object should also have a
writable \member{softspace} attribute, which should be initialized to
-zero. This will be automatic for classes implemented in Python; types
-implemented in C will have to provide a writable \member{softspace}
-attribute.
+zero. This will be automatic for most classes implemented in Python
+(care may be needed for objects that override attribute access); types
+implemented in C will have to provide a writable
+\member{softspace} attribute.
\end{memberdesc}
\subsubsection{Internal Objects \label{typesinternal}}