typo

book.tex

@@ -7840,7 +7840,7 @@ the following code.
 {\if\edition\pythonEd
 \begin{lstlisting}
 x = input_int()
-y = intput_int()
+y = input_int()
 print(((y + 2) if x == 0 else (y + 10)) \
       if (x < 1) \
       else ((y + 2) if (x == 2) else (y + 10)))