Lab: Functions#
This lab will help you get practice using functions. It will also help you understand how functions are specified. From now on most of the things that I will have you write will be in a function. It’s important that you structure your function to match the question exactly.
Here’s an example of a function specification. It tells you the name of the function, what it should return the names of the arguments (if any) and their order. Though the argument names can change everything else should be the same.
Name:
the_function
Arguments:
arg1
(string) - The first argumentarg2
(integer) - The second argument
Return Values:
Your name (string)
Here’s how you setup the answer:
def the_function(arg1, arg2):
"""This is the docstring for the_function"""
# Put your code here
return "Mike"
Before you turn in or test your function make sure that:
You used the correct name
There is a docstring
You have the same number of arguments (you can rename them if you like)
You return the requested value. If the requested value is
None
you can simplyreturn
Part 1: Writing Functions#
1. Write foo
#
Write a function called foo
that takes one argument bar
. The function should print
the contents of bar
.
Name:
foo
Arguments:
bar
(string) - The thing to print
Returns:
None
[ ]:
Test your function using the cell below:
[ ]:
2. Write do_sum
#
Write a function called do_sum
that takes two arguments, a
and b
. The function should print
the sum of its arguments.
Name:
do_sum
Arguments:
a
(float) - A numberb
(float) - Another number
Returns:
None
[ ]:
Test your function in the cell below:
[ ]:
3. Print Repeated#
Write a function called print_repeat
that takes two arguments, words
and times
. The function prints words
times
times.
Name:
print_repeat
Arguments:
words
(string) - The words to repeattimes
(integer) - Another number
Returns:
None
[ ]:
Test your function is the cell below:
[ ]:
4. A Return Value#
Write a function called i_am_four
that returns the number 4
.
Name:
i_am_four
Arguments: None
Returns:
4
[ ]:
Test your function in the cell below:
[ ]:
5. Arguments and Return Values#
Write a function called do_sum_return
that takes two arguments, a
and b
. The function returns the sum of the two numbers.
Name:
do_sum_return
Arguments:
a
(float) A numberb
(float) Another number
Returns: The sum of
a
andb
[ ]:
Test your function in the cell below:
[ ]:
6. Returning a Boolean Value#
Write a function called is_greater
that takes two arguments called a
and b
. The function returns True
if a
is greater than b
, False
otherwise.
Name:
is_greater
Arguments:
a
(float) A numberb
(float) A number
Returns:
True if
a
is greater thanb
.False
otherwise.
[ ]:
Test your function in the cell below:
[ ]:
Part 2: Using Your Own Functions#
In this part you’ll write reusable functions and use them to make a simple program.
1. Write a triangle
Function#
Write a function to draw a triangle
that takes two arguments, tu
a turtle, and len
the length of a side. The function draws an equallateral triangle with sides of len
pixels.
Name:
triangle
Arguments:
tu
(Turtle) a turtle to draw with.len
(int) the length of a side
[ ]:
2. Draw Using triangle
#
Use the triangle
funciton from the last question to construct a figure like this:
Notice that it’s made of three triangles, two at the base and one on top.
[ ]: