As usual, create two directories for today's class. Create a
directory called lecture7 under activities, and
a directory called lab7 under labs.
Writing your own function can greatly increase readability, as well as code reuse. Last class, we saw how we could write a function using the input function to create an interactive function. There is a better way to define these functions, using parameters.
In a file called lots_of_rectangles.py, create a Python
function that takes an x coordinate, a y coordinate, a
width, and a height and draws a rectangle of the specified dimensions
that is centered on the specified position.
You will need to use the turtle.penup and
turtle.pendown to allow the turtle to move without drawing.
You can use the turtle.goto function to move the turtle
to an arbitrary location.
Use your newly defined function to draw a small grid pattern on the screen.
There are some things you need to know, in order to make your code more readable when using functions. Specifically, how to comment these functions.
As you have no doubt noticed, all of the functions you have written
thus far have done one thing, and displayed the result to the screen
in some way (either by drawing or printing). That's not the only way
to allow a function to provide its information; You have certainly
seen functions that provide information back to where it was called
from. We can do that using return statements.
Create a function called calculate_paint_volume in a file
called paint.py.The function should return the number of
gallons of paint that are required to paint walls of rectangular room
given the length, width, and height of the room in feet. Assume that
the floor and ceiling will also be painted and that paint can cover
350 square feet of wall per gallon. The number of gallons should be a
real number.
In a file called bmi_redux.py, create two functions called
convert_pounds_to_kg and
convert_feet_into_meters. Each function should take one
parameter: a weight in pounds and a height in feet respectively. They
should return a weight in kilograms and a height in meters.
Write a new BMI computation function, bmi_us that takes
as input a weight in pounds and a height in feet. Your new function
should call the function that we finished writing in class today, and
return the BMI of the requested individual.
When you have finished, create a tar file of your lab7
directory. To submit your activity, go to cseval.roanoke.edu. You should
see an available assignment called Lab Assignment 7. 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!