Some changes in the index (references to function)

espinoza · web-flow · commit c645ce560994 · 2019-10-08T03:47:14.000-03:00
I suggest these changes to join some references to function.
diff --git a/book/book.tex b/book/book.tex
@@ -1961,7 +1961,7 @@ \section{Function calls}
 
 \section{Math functions}
 \index{math function}
-\index{function, math}
+\index{function!math}
 
 Python has a math module that provides most of the familiar
 mathematical functions.  A {\bf module} is a file that contains a
@@ -2007,7 +2007,7 @@ \section{Math functions}
 \index{sine function}
 \index{radian}
 \index{trigonometric function}
-\index{function, trigonometric}
+\index{function!trigonometric}
 
 The second example finds the sine of {\tt radians}.  The variable name {\tt radians} is a hint that {\tt sin} and the other trigonometric
 functions ({\tt cos}, {\tt tan}, etc.)  take arguments in radians. To
@@ -2454,8 +2454,8 @@ \section{Stack diagrams}
 \section{Fruitful functions and void functions}
 \index{fruitful function}
 \index{void function}
-\index{function, fruitful}
-\index{function, void} 
+\index{function!fruitful}
+\index{function!void} 
 
 Some of the functions we have used, such as the math functions, return
 results; for lack of a better name, I call them {\bf fruitful
@@ -2522,7 +2522,7 @@ \section{Fruitful functions and void functions}
 
 
 \section{Why functions?}
-\index{function, reasons for}
+\index{function!reasons for}
 
 It may not be clear why it is worth the trouble to divide
 a program into functions.  There are several reasons:
@@ -9696,7 +9696,7 @@ \section{Tuples as return values}
 \index{tuple}
 \index{value!tuple}
 \index{return value!tuple}
-\index{function, tuple as return value}
+\index{function!tuple as return value}
 
 Strictly speaking, a function can only return one value, but
 if the value is a tuple, the effect is the same as returning
