Development - Intermediate, exercise 1

Text

Write the body of the Python function def do_it(string, number) that takes a string and a number in input, and returns the string "Oh no!" if the number of characters that are vowels (i.e. that are “a”, “e”, “i”, “o”, “u”) in string is less than number, otherwise it returns a queue containing all the vowels in string. In this latter case, the vowels are inserted in the queue in the same order they appear in string. Example of execution:

def do_it(string, number):
    pass  # To implement

my_string = "yes mama"
my_number = 2
do_it(my_string, my_number)  # returns deque(["e", "a", "a"])

Solution

from collections import deque


# Test case for the function
def test_do_it(string, number, expected):
    result = do_it(string, number)
    if expected == result:
        return True
    else:
        return False


# Code of the function
def do_it(string, number):
    result = deque()

    for c in string:
        if c in "aeiou":
            result.append(c)

    if len(result) < number:
        return "Oh no!"
    else:
        return result


# Tests
print(test_do_it("just a string", 5, "Oh no!"))
print(test_do_it("just a string", 2, deque(["u", "a", "i"])))

Additional material

The runnable Python file is available online.