The reading for this assignment is Chapter 12
of How to think....
- wget http://wb/ip/code/ip_hw05_soln.py and make a copy
named hw10.py. You should have a hardcopy of ip_hw05_soln.py;
read it and make sure you understand it.
- Run hw10.py and confirm that it does what you expect.
- Modify the program so that it creates a third Amoeba named pat.
If you type more /usr/X11R6/lib/X11/rgb.txt you will see a list
of the color names Python recognizes. You can make pat any
color you want. Inside the loop, add a line to move pat and
remove the lines that invoke nudge. Run the program again.
- Rather than invoke move three times, you can use a for
loop to move each of the Amoebas. The object named world has an
attribute named animals that is a list of the animals that have
First, add a line of code (after you create the third
Amoeba) and print world.animals. Run the program and confirm
that the list contains three instances.
Now replace the three move calls with a loop that traverses
the list of animals and calls move for each one. Run the program
and confirm that the Amoebas still move.
- The next step is to detect and handle collisions between
Create a new function called collide that takes two
Amoebas as parameters. For now, it should just print the two
Now write a function called check_collisions that takes an
Amoeba and a list of Amoebas. For each Amoeba in the list, it should
compute the distance to the given Amoeba. If the distance is less
than 1, it should invoke collide.
Finally add code in main to detect collisions by invoking
- Since you took out the nudge statements, you might find
that it takes a while for Amoebas to find each other. But now that
there are more than two Amoebas, it's not as clear who should be
Add an attribute named crush to each Amoeba. For each
Amoeba crush should be another Amoeba. If you are feeling
mischievous, you can create a love triangle. Now modify move
so that after invoking teleport, it invokes nudge to
move the Amoeba closer to crush.
- Inside mate, you can print the Amoeba objects, but you
might notice that Amoebas don't really know their names! Add an
attribute named name to each Amoeba. Modify collide
so it prints the names of the Amoebas that collided.
- Modify make_amoeba so that each Amoeba has an attribute
named spouse that is initially None.
Modify mate so that if two Amoebas collide, and neither one
has a spouse, they get married (using your code from Evaluation 7).
You might want to change the color of the nucleus (the color2
attribute) to indicate which Amoebas are married.
- Challenge: Modify mate so that if two Amoebas collide, and
they are already married, they create a new smaller Amoeba. The new
Amoeba should have an attribute that identifies it as a juvenile, so
that if it collides with another Amoeba, it doesn't get married.
- Challenge: Make Amoebas wait at least 20 moves after they get
married and before they spawn another Amoeba.