update GC figures for python

book.tex

@@ -25,7 +25,7 @@
 
 \def\racketEd{0}
 \def\pythonEd{1}
-\def\edition{0}
+\def\edition{1}
 
 % material that is specific to the Racket edition of the book
 \newcommand{\racket}[1]{{\if\edition\racketEd{#1}\fi}}
@@ -11242,8 +11242,11 @@ begin with so we will not need to revisit this issue.
 
 \begin{figure}[tbp]
 \centering
-\includegraphics[width=\textwidth]{figs/copy-collect-1} \\[5ex]
-\includegraphics[width=\textwidth]{figs/copy-collect-2}
+\racket{\includegraphics[width=\textwidth]{figs/copy-collect-1}}
+\python{\includegraphics[width=\textwidth]{figs/copy-collect-1-python}}
+\\[5ex]
+\racket{\includegraphics[width=\textwidth]{figs/copy-collect-2}}
+\python{\includegraphics[width=\textwidth]{figs/copy-collect-2-python}}
 \caption{A copying collector in action.}
 \label{fig:copying-collector}
 \end{figure}
@@ -11284,7 +11287,9 @@ then updates the pointers in the popped tuple so they point to the
 newly copied tuples.
 
 \begin{figure}[tbp]
-\centering \includegraphics[width=0.9\textwidth]{figs/cheney}
+\centering
+\racket{\includegraphics[width=0.9\textwidth]{figs/cheney}}
+\python{\includegraphics[width=0.9\textwidth]{figs/cheney-python}}
 \caption{Depiction of the Cheney algorithm copying the live tuples.}
 \label{fig:cheney}
 \end{figure}
@@ -11344,7 +11349,9 @@ contains the two pointers from the regular stack and also the pointer
 in the second register.
 
 \begin{figure}[tbp]
-\centering \includegraphics[width=0.60\textwidth]{figs/root-stack}
+  \centering
+  \racket{\includegraphics[width=0.60\textwidth]{figs/root-stack}}
+  \python{\includegraphics[width=0.60\textwidth]{figs/root-stack-python}}
 \caption{Maintaining a root stack to facilitate garbage collection.}
 \label{fig:shadow-stack}
 \end{figure}