Fix the strange case of
\begin{methoddesc}[NNTP]{...}
where
\ifx#1\@undefined ended up comparing N and N, therefore executing
the true part of the conditional, blowing up at \@undefined.
diff --git a/Doc/texinputs/python.sty b/Doc/texinputs/python.sty
index 3ce62f4..494323e 100644
--- a/Doc/texinputs/python.sty
+++ b/Doc/texinputs/python.sty
@@ -612,7 +612,7 @@
\newenvironment{cfuncdesc}[4][\py@badkey]{
\begin{fulllineitems}
\cfuncline{#2}{#3}{#4}
- \ifx#1\@undefined\else%
+ \ifx\@undefined#1\relax\else%
\emph{Return value: \textbf{#1}.}\\
\fi
}{\end{fulllineitems}}
@@ -629,7 +629,7 @@
\newenvironment{ctypedesc}[2][\py@badkey]{
\begin{fulllineitems}
\item[\bfcode{#2}%
- \ifx#1\@undefined%
+ \ifx\@undefined#1\relax%
\index{#2@{\py@idxcode{#2}} (C type)}
\else%
\index{#2@{\py@idxcode{#1}} (C type)}
@@ -712,7 +712,7 @@
% \begin{methoddesc}[classname]{methodname}{args}
\newcommand{\methodline}[3][\@undefined]{
\methodlineni{#2}{#3}
- \ifx#1\@undefined
+ \ifx\@undefined#1\relax
\index{#2@{\py@idxcode{#2()}} (\py@thisclass\ method)}
\else
\index{#2@{\py@idxcode{#2()}} (#1 method)}
@@ -720,7 +720,7 @@
}
\newenvironment{methoddesc}[3][\@undefined]{
\begin{fulllineitems}
- \ifx#1\@undefined
+ \ifx\@undefined#1\relax
\methodline{#2}{#3}
\else
\def\py@thisclass{#1}
@@ -740,7 +740,7 @@
% object data attribute --------------------------------------------------
% \begin{memberdesc}[classname]{membername}
\newcommand{\memberline}[2][\py@classbadkey]{%
- \ifx#1\@undefined
+ \ifx\@undefined#1\relax
\memberlineni{#2}
\index{#2@{\py@idxcode{#2}} (\py@thisclass\ attribute)}
\else
@@ -750,7 +750,7 @@
}
\newenvironment{memberdesc}[2][\py@classbadkey]{
\begin{fulllineitems}
- \ifx#1\@undefined
+ \ifx\@undefined#1\relax
\memberline{#2}
\else
\def\py@thisclass{#1}
@@ -1046,14 +1046,14 @@
% \versionchanged[short explanation]{2.0}
%
\newcommand{\versionadded}[2][\py@badkey]{%
- \ifx#1\@undefined%
+ \ifx\@undefined#1\relax%
{ New in version #2. }%
\else%
{ New in version #2:\ #1. }%
\fi%
}
\newcommand{\versionchanged}[2][\py@badkey]{%
- \ifx#1\@undefined%
+ \ifx\@undefined#1\relax%
{ Changed in version #2. }%
\else%
{ Changed in version #2:\ #1. }%