Functions Practice

Let’s try some simple practice problems. These problems are not graded - they are just for you to practice before doing the real exercises in the lab itself. You can find the answers below each question by clicking the button below each question.

6.1 Reading Code

Write the output that is displayed to the user after running the following Python program:

def foo(word):
    print(word, end=" ")


def bar(word1, word2, word3):
    foo(word1)
    foo(word2)
    print("don't make a", end=" ")
    print(word3)


def main():
    bar("two", "wrongs", "right")


main()

two wrongs don't make a right

6.2 Writing Code

Construct a function (not an entire program) that meets the following specification. When the function is called using this line of code:

fun("s", "e", "l" "r")

it should produce the following output:

seller

When the same function is called using this line of code:

fun("p", "i", "p", "n")

it should produce the following output:

pippin

def fun(one, two, three, four):
    print(one, end="")
    print(two, end="")
    print(three, end="")
    print(three, end="")
    print(two, end="")
    print(four, end="")

6.3 Writing Code

Write a complete program in Python that meets the following specification:

1. It should include a function named display that requires a single parameter. When run, that function should print the value of the parameter to the terminal, but without a newline character at the end.
2. It should include a function named square that will call the display function multiple times to create an ASCII art square as shown in the output example below. The square procedure may not use the print(expression) statement directly - it must call the display function to produce output.
3. It should include a main function that only calls the square function.
4. It should call the main function at the end of the code to start the program.

When the program is run, it should produce the following output:

* * * *
* * * *
* * * *
* * * *

def display(line):
    print(line, end="")


def square():
    display("* * * *\n")
    display("* * * *\n")
    display("* * * *\n")
    display("* * * *\n")


def main():
    square()


main()