exercise_4_solution.md

Unit 4 Practice Solutions

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4.1

Using a for loop, ask the user for the name of three items (animals, colors, fruits, or whatever you'd like).

Solution

# empty list
animals = []

for i in range(3):
    # ask the user for an animal
    animal = input("Enter an animal: ")
    # add it to the list
    animals.append(animal)

print(f'animals: {animals}')

Output

Enter an animal: lynx
Enter an animal: ocelot
Enter an animal: jaguar

animals: ['lynx', 'ocelot', 'puma']

4.2

Loop through the user's list and with iteration, print both the item and all the letters in the item

Solution

# empty list
animals = []

# ask the user for three animals
for i in range(3):
    # ask the user for an animal
    animal = input("Enter an animal: ")
    # add it to the list
    animals.append(animal)

# loop through the animals
for animal in animals:
    # print the current animal name
    print(animal)

# loop through the letters in the animal name
for letter in animal:
    # print the current letter
    print(letter)

Output

Enter an animal: lynx
Enter an animal: ocelot
Enter an animal: puma

lynx
l
y
n
x
ocelot
o
c
e
l
o
t
puma
p
u
m
a

4.3

Solution

# empty list
animals = []

# ask the user for three animals
for i in range(3):
    # ask the user for an animal
    animal = input("Enter an animal: ")
    # add it to the list
    animals.append(animal)

# empty list
letters_used = []

# loop through the animals
for animal in animals:

    # loop through the letters in the animal name
    for letter in animal:

        # if the letter isn't in the characters list,
        if letter not in letters_used:
            # add it
            letters_used.append(letter)

# display result
print(f'letters used: {letters_used}')

Output

Enter an animal: lynx
Enter an animal: ocelot
Enter an animal: puma

Letters used:
['l', 'y', 'n', 'x', 'o', 'c', 'e', 't', 'p', 'u', 'm', 'a']

Keep in mind that is is just one potential solution

< Exercise 4

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