Update page 'Day 2 homework'

Day 2 homework.md

@@ -10,7 +10,7 @@
 2. For each of the types string, bytestring, integer, floating point, and imaginary literals, construct a 5x5 table showing what happens when the character "0" or number 0 is compared to each other type.
 3. Now do the same thing for the + and == operators for each pair of types in two other 5x5 tables.
 4. Write a small program that uses the AST module to open the lexer/parser example, and dumps the resulting AST.  See if there are any arguments to the parse method which make the output easier to read.
-5. What does this do?  `print("\007")`  Can you figure out why?
+5. What does this do?  `print("\007")`  Can you figure out why? [1]
 6. What does this do?  `print("abcdefg\rhijklmnop")`  Can you figure out why?
 7. This is an HTTP server.  Run it and connect to http://localhost:8000 .  Why doesn't this do the same thing as what you see above?  (don't forget to shut down the HTTP server afterward.)
 
@@ -57,4 +57,6 @@ except ValueError as err:
     print("✅ test2 pass!")
 ```
 
-        
+Footnotes:
+
+[1] You have to turn on the setting `terminal.integrated.enableBell` in Visual Studio Code for the bell to work.