atof() description: Add information about accepting 'NaN' to produce
the NaN value.
diff --git a/Doc/lib/libfuncs.tex b/Doc/lib/libfuncs.tex
index 3f24101..316b294 100644
--- a/Doc/lib/libfuncs.tex
+++ b/Doc/lib/libfuncs.tex
@@ -231,12 +231,13 @@
\begin{funcdesc}{float}{x}
Convert a string or a number to floating point. If the argument is a
string, it must contain a possibly signed decimal or floating point
- number, possibly embedded in whitespace;
- this behaves identical to \code{string.atof(\var{x})}.
- Otherwise, the argument may be a plain or
- long integer or a floating point number, and a floating point number
- with the same value (within Python's floating point precision) is
- returned.
+ number, possibly embedded in whitespace, or be \code{'NaN'} (case
+ insensitive); this behaves identical to
+ \code{string.atof(\var{x})}. If the string is \code{'NaN'}, the
+ IEEE ``Not a Number'' value is returned. Otherwise, the argument
+ may be a plain or long integer or a floating point number, and a
+ floating point number with the same value (within Python's floating
+ point precision) is returned.
\end{funcdesc}
\begin{funcdesc}{getattr}{object, name}
diff --git a/Doc/lib/libstring.tex b/Doc/lib/libstring.tex
index 4424863..56dcf6d 100644
--- a/Doc/lib/libstring.tex
+++ b/Doc/lib/libstring.tex
@@ -59,9 +59,11 @@
\begin{funcdesc}{atof}{s}
Convert a string to a floating point number. The string must have
the standard syntax for a floating point literal in Python,
- optionally preceded by a sign (\samp{+} or \samp{-}). Note that
- this behaves identical to the built-in function
- \function{float()}\bifuncindex{float} when passed a string.
+ optionally preceded by a sign (\samp{+} or \samp{-}), or be
+ \code{'NaN'} (case insensitive) to indicate the IEEE ``Not a
+ Number'' value. Note that this behaves identical to the built-in
+ function \function{float()}\bifuncindex{float} when passed a
+ string.
\end{funcdesc}
\begin{funcdesc}{atoi}{s\optional{, base}}