After the lab, you should know how to
lab2
in your
labs
directory. Your programs and the output for this
lab will all be saved in the lab2
directory.graphics.py
in /home/courses/cs111/handouts/lab2/
into
your lab2
directory.We'll practice writing several Python programs, each in their own text file. Name the files lab2.1.py through lab2.8.py.
Your programs will be graded on correctness, style, and how well you tested them. Make sure you adhere to the good development and testing practices we discussed in class. Your code should be readable and your output should be useful and well-formatted.
After you've developed a correct solution to each program, restart IDLE or close and reopen the IDLE "shell" by running the program again (using F5), demonstrate that the program works using several good test cases, and save the output to a file named lab2.x.out, where x is the problem number.
Write a program that takes the number of greatest hits and the size of the cds (in terms of the number of tracks) and determines how many cds are needed and how many tracks will have to wait for the next Greatest Hits album.
This program determines the number of CDs in a Greatest Hits album. How many greatest hits/tracks do you have? 24 How many tracks fit on a cd? 10 Your album requires 2 cds 4 tracks will have to wait for the next Greatest Hits album.
Note: you may have some grammar issues in your output. We don't know how to fix those yet.
Atom | Weight (g/mol) |
---|---|
H | 1.0079 |
C | 12.011 |
O | 15.9994 |
You program should prompt the user for the number of atoms of each type and display the total weight with the appropriate units.
Note that your program should use constants for the molecular weights of carbon, hydrogen, and oxygen. (Recall what the conventions are for naming constants. Why does it make sense to make these values constants?)
Finally, modify your program so that it rounds the molecular weight to 3 decimal places (using a built-in function) and displays that number.
A sample run is shown below:
Enter number of Hydrogen atoms: 3 Enter number of Carbon atoms: 2 Enter number of Oxygen atoms: 1 Weight of molecule is 43.045 g/mol
pi
defined in the math
module.
Select a "reasonable" number of digits for precision in the result you
display to the user.
result = i % j
. Use
assignment and print statements and a for
loop to show
the results of i % j, where i = 6 and j increases from 1 to 8.
Example output (without the appropriate values filled in):
6 % 1 = ? 6 % 2 = ? ...
If you're having difficulty solving this problem, think about: How many times does this loop need to execute? What needs to be repeated? Try solving this problem by hand, calculating and writing out the results. You won't receive any help until we see that you have something written out. Hint: this is a modification of the accumulator design pattern.
graphics
module, draw a yellow
circle with radius 30 and a red square of width 50 in a window
that is 400x200 with the name "Practice". Position the circle in
the upper-left quadrant of the canvas and the square in the
lower-right quadrant. There will be no IDLE output for this
program.
graphics
module, draw the beginning
of a snow-person. Create a canvas with the title "Snow Person".
Draw a white circle of radius 50. Clone the circle and
move the cloned circle above the first circle (so that the circle
appears to be sitting on top of the original circle). Repeat with
a third cloned circle. Draw two black, filled-in circles for eyes
in the top circle. Note that you should draw one eye,
then clone
the eye and move it to the appropriate
place. There will be no IDLE output for this
program.lab2
directory into
the turnin
directory. (Review
the UNIX handout if you don't remember
how to do that.)labs/lab2
directory; otherwise, the
print out will be long and screwed up. You can move those files
back into your lab2
directory after you've
printed. In other words, you should only have the .py
files you wrote and the .out files you created in your directory
when you print.printLab.sh
command:
printLab.sh <labdirname>
Again, you should probably print from
the labs
directory.
View your file using the gv
command.
Print the file using the lpr
command introduced in the
first lab.
Labs are due at the beginning of Friday's class. You should hand
in the printed copy at the beginning of class, and the electronic
version should be in the turnin
directory before 1:20 p.m. on Friday.
Ask well before the deadline if you need help turning in your assignment!