Explain comments at the start of chapter 3. This is needed since they

freddrake · freddrake · commit bdadf0f7f313 · 1999-04-29T13:20:25.000Z
appear in the examples without any further explanation, and the
tutorial doesn't have this information explicit anywhere else.
Omission reported by Jon Black &lt;jblack@Ridgeway-Sys.com&gt;.
diff --git a/Doc/tut/tut.tex b/Doc/tut/tut.tex
@@ -285,7 +285,9 @@ \subsection{Executable Python Scripts \label{scripts}}
 
 (assuming that the interpreter is on the user's \envvar{PATH}) at the
 beginning of the script and giving the file an executable mode.  The
-\samp{\#!} must be the first two characters of the file.
+\samp{\#!} must be the first two characters of the file.  Note that
+the hash, or pound, character, \character{\#}, is used to start a
+comment in Python.
 
 \subsection{The Interactive Startup File \label{startup}}
 
@@ -328,7 +330,7 @@ \chapter{An Informal Introduction to Python \label{informal}}
 presence or absence of prompts (\samp{>>> } and \samp{... }): to repeat
 the example, you must type everything after the prompt, when the
 prompt appears; lines that do not begin with a prompt are output from
-the interpreter.%
+the interpreter. %
 %\footnote{
 %        I'd prefer to use different fonts to distinguish input
 %        from output, but the amount of LaTeX hacking that would require
@@ -337,6 +339,23 @@ \chapter{An Informal Introduction to Python \label{informal}}
 Note that a secondary prompt on a line by itself in an example means
 you must type a blank line; this is used to end a multi-line command.
 
+Many of the examples in this manual, even those entered at the
+interactive prompt, include comments.  Comments in Python start with
+the hash character, \character{\#}, and extend to the end of the
+physical line.  A comment may appear at the start of a line or
+following whitespace or code, but not within a string literal.  A hash 
+character within a string literal is just a hash character.
+
+Some examples:
+
+\begin{verbatim}
+# this is the first comment
+SPAM = 1                 # and this is the second comment
+                         # ... and now a third!
+STRING = "# This is not a comment."
+\end{verbatim}
+
+
 \section{Using Python as a Calculator \label{calculator}}
 
 Let's try some simple Python commands.  Start the interpreter and wait
