Marc-Andre Lemburg <mal@lemburg.com> noted that the encode() string method

freddrake · freddrake · commit 1dba66cb72b9 · 2000-10-25T21:03:55.000Z
was added in 2.0.
diff --git a/Doc/lib/libstdtypes.tex b/Doc/lib/libstdtypes.tex
@@ -425,6 +425,7 @@ \subsubsection{String Methods \label{string-methods}}
 \code{'strict'}, meaning that encoding errors raise a
 \exception{ValueError}.  Other possible values are \code{'ignore'} and
 \code{'replace'}.
+\versionadded{2.0}
 \end{methoddesc}
 
 \begin{methoddesc}[string]{endswith}{suffix\optional{, start\optional{, end}}}
