Lecture 13 - Test Recap, Functions, and Drawing
As usual, create two directories for today's class. Create a
directory called lecture13 under activities, and
a directory called lab13 under labs.
Test Recap
- Mean
- 67.8
- Median
- 66.75
- Maximum
- 95
- Standard Deviation
- 17.67
Clearing Up - For Loops, Variables, and Accumulators (Oh my!)
I have, purposefully, been hiding some information about how for
loops work. It seems that it might have been a mistake to do so.
Specifically, how range operates. Hopefully, seeing
how range operates will alleviate some of the confusion.
In-class Activity 1
Fibonacci Spirals
I brought up the Fibonacci Sequence in the bonus question on the test. One of the neat things about the sequence is its exceedingly simple definition. Let Fn define the nth number in the Fibonacci sequence, where F1 = 1 and F2 = 1. Then, the nth number can be computed as: Fn = Fn - 1 + Fn - 2
Create a file called fib_spiral.py in
your lecture13 directory. Create a
function fib, which takes a single
parameter n. This function should return
the nth Fibonacci number. This
function should work for all n > 0.
Functions Again
turtle way
The only way you know how to write interactive programs thus far is by
using the input function. As many of you have seen, this
is quite cumbersome when your program is using turtle to display
things. Wouldn't it be nicer if the user could interact with the mouse?
Lab Assignment 13
FISH....again?
Yes, we are doing fish again. You can copy your fish code from lecture 11 by executing the following commands:
cd ~/cs120/labs/lab13 cp ../lab11/fish.py .
If your previous draw_fish method did not work entirely
correctly, spend some time to fix it. You can use the helpful image
below as your guide:
Rework your draw_fish function so that it draws with a
constantly defined width. Then, using the turtle.onscreenclick
function, allow the user of your program to draw a fish centered on
where the user clicked on the screen.
Submission
When you have finished, create a tar file of your lab13
directory. To create a tar file, execute the following commands:
cd ~/cs120/labs tar czf lab13.tgz lab13/
To submit your activity, go to cseval.roanoke.edu. You should
see an available assignment called Lab Assignment 13. Only
one of your pair should submit your activity. Make sure both partners
are listed in the header of your file.
Do not forget to email your partner todays files!
Last modified: Thu Sep 26 19:11:02 EDT 2013