CSC 15 Lab 3  9/17/07
			
			     Due 9/24

Part I:

   Part II of the assignment asks you to animate the stick figure you
drew in lab2.  Download the template danim.py from the class homepage.
Right now it animates a diamond.  You are to animate your stick figure.
During the animation sequence, you need to:
   
   1. Change the size of the figure to both smaller and larger
   2. Change the position of the figure by changing the x,y coordinates.
   3. Make the arms repeatedly go up-straight-down so it appears to be flying.
      This part may require you to use if and if-else statements.

   Demonstrate your program to the professor when you're done.

part Ib:  Important Linux commands.

     When running programs that draw graphics, please do not move the window
     while the program is running.  If all goes well the program should stop
     when the mydraw function finishes.  But sometimes you may want to stop
     it in the middle.  For this, the best thing to do is the following:

     At the terminal prompt where you ran the program, type Control-Z.  You'll
     see a message such as 
     
     [5]+  Stopped                 python danim.py

     This program is now a zombie.  A zombie is a program that should be
     dead but is not.  You need to kill it with the following command:

     kill -9 %5

     The "5" needs to match the number in the message above.  Don't leave
     zombies around.

     At the command prompt, type the word "jobs".  This shows all the
     programs at their current status are were started from the terminal window.
     You can kill them with the same command.


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Part II:  

This part of the assignment allows you to practice using the if-else
construct.  It also teaches you to think about programs in a structural
way.

You are to write a program that asks the user a series of questions in
order to guess what kind of animal the user is talking about.  The
user can answer the questions with either True or False (1 or 0 can
also be used)

  Here's a sample output of what the program might look like:

Computer: Is it a mammal?  True
Computer: Does it walk on four legs? True
Computer: Does it prey on other animals? True

Computer: According to my database, your animal is likely a tiger.
----

Of course, more questions would be needed to really pin the answer down 
to a tiger.  Your program needs to ask enough questions to distinguish
between the following animals:

tiger, horse, rabbit, shark, bass, turtle, snake, chicken, hawk

Note the above line of questions was enough to exclude all other
possibilites except tiger.  You should draw a species tree to determine
what and how many questions you need to ask.

* If the answers do not match any of the animals in your database, 
you are to output a message indicating so:

Computer: I'm sorry, I've no information on such an animal

*** Important rule: each question can only ask a single trait, i.e,
you can not ask "is it a tiger" directly - that would be cheating!


---
Your program will consist of a number of if-else statements nested within
if-else statments.  Note that commenting is very important, in addition
to the indentation, to clarify the structure of the program.  When writing
if and if-else statements involving more than one or two lines of code,
you MUST comment the end of each logical block of code.

          *** I WILL NOT HELP YOU DEBUG UNCOMMENTED CODE ***

Here's something to get you started with:

# Variables to use:
# mammal, fly,  ...

print "Think of an animal among tiger, horse, rabbit, shark, bass, turtle, snake, chicken, hawk"

mammal = input("Is it a mammal? ")
if (mammal == True):
   # ask next question based on answer:
   fly = input("can it fly> ")
   if (fly):
      # next question based on a mammal that can fly
   else:
      # next question based on a mammal that cannot fly
   # end mammal   
else:  
   # not a mammal, next question ...

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After you're finished with this part, put a while loop around your entire
code so that the program will execute repeatedly:


again = True   # variable to indicate if user wants to play again

while (again)
  # code for determining animal, excluding variable declarations
  again = input("go again? ")
# end while


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What to turn in:

1. Write up on paper, including "decision tree"
2. Source code.  All variables used must be commented.  
   Each enclosed {} segment should include comments as to its purpose
   (as in above example)
3. two sets of output


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