Solutions - Chapter 7
- 7-1: Rental Car
- 7-2: Restaurant Seating
- 7-3: Multiples of Ten
- 7-4: Pizza Toppings
- 7-5: Movie Tickets
- 7-8: Deli
- 7-9: No Pastrami
- 7-10: Dream Vacation
Back to solutions.
Note: Sublime Text doesn’t run programs that prompt the user for input. You can use Sublime Text to write programs that prompt for input, but you’ll need to run these programs from a terminal. See “Running Python Programs from a Terminal” on page 12.
7-1: Rental Car
Write a program that asks the user what kind of rental car they would like. Print a message about that car, such as “Let me see if I can find you a Subaru”.
car = input("What kind of car would you like? ")
print(f"Let me see if I can find you a {car.title()}.")
Output:
What kind of car would you like? Toyota Tacoma
Let me see if I can find you a Toyota Tacoma.
7-2: Restaurant Seating
Write a program that asks the user how many people are in their dinner group. If the answer is more than eight, print a message saying they’ll have to wait for a table. Otherwise, report that their table is ready.
party_size = input("How many people are in your dinner party tonight? ")
party_size = int(party_size)
if party_size > 8:
print("I'm sorry, you'll have to wait for a table.")
else:
print("Your table is ready.")
Output:
How many people are in your dinner party tonight? 12
I'm sorry, you'll have to wait for a table.
or:
How many people are in your dinner party tonight? 6
Your table is ready.
7-3: Multiples of Ten
Ask the user for a number, and then report whether the number is a multiple of 10 or not.
number = input("Give me a number, please: ")
number = int(number)
if number % 10 == 0:
print(f"{number} is a multiple of 10.")
else:
print(f"{number} is not a multiple of 10.")
Output:
Give me a number, please: 23
23 is not a multiple of 10.
or:
Give me a number, please: 90
90 is a multiple of 10.
7-4: Pizza Toppings
Write a loop that prompts the user to enter a series of pizza toppings until they enter a quit value. As they enter each topping, print a message saying you’ll add that topping to their pizza.
prompt = "\nWhat topping would you like on your pizza?"
prompt += "\nEnter 'quit' when you are finished: "
while True:
topping = input(prompt)
if topping != 'quit':
print(f" I'll add {topping} to your pizza.")
else:
break
Output:
What topping would you like on your pizza?
Enter 'quit' when you are finished: pepperoni
I'll add pepperoni to your pizza.
What topping would you like on your pizza?
Enter 'quit' when you are finished: sausage
I'll add sausage to your pizza.
What topping would you like on your pizza?
Enter 'quit' when you are finished: bacon
I'll add bacon to your pizza.
What topping would you like on your pizza?
Enter 'quit' when you are finished: quit
7-5: Movie Tickets
A movie theater charges different ticket prices depending on a person’s age. If a person is under the age of 3, the ticket is free; if they are between 3 and 12, the ticket is $10; and if they are over age 12, the ticket is $15. Write a loop in which you ask users their age, and then tell them the cost of their movie ticket.
prompt = "How old are you?"
prompt += "\nEnter 'quit' when you are finished. "
while True:
age = input(prompt)
if age == 'quit':
break
age = int(age)
if age < 3:
print(" You get in free!")
elif age < 13:
print(" Your ticket is $10.")
else:
print(" Your ticket is $15.")
Output:
How old are you?
Enter 'quit' when you are finished. 2
You get in free!
How old are you?
Enter 'quit' when you are finished. 3
Your ticket is $10.
How old are you?
Enter 'quit' when you are finished. 12
Your ticket is $10.
How old are you?
Enter 'quit' when you are finished. 18
Your ticket is $15.
How old are you?
Enter 'quit' when you are finished. quit
7-8: Deli
Make a list called sandwich_orders and fill it with the names of various sandwiches. Then make an empty list called finished_sandwiches. Loop through the list of sandwich orders and print a message for each order, such as I made your tuna sandwich. As each sandwich is made, move it to the list of finished sandwiches. After all the sandwiches have been made, print a message listing each sandwich that was made.
sandwich_orders = ['veggie', 'grilled cheese', 'turkey', 'roast beef']
finished_sandwiches = []
while sandwich_orders:
current_sandwich = sandwich_orders.pop()
print(f"I'm working on your {current_sandwich} sandwich.")
finished_sandwiches.append(current_sandwich)
print("\n")
for sandwich in finished_sandwiches:
print(f"I made a {sandwich} sandwich.")
Output:
I'm working on your roast beef sandwich.
I'm working on your turkey sandwich.
I'm working on your grilled cheese sandwich.
I'm working on your veggie sandwich.
I made a roast beef sandwich.
I made a turkey sandwich.
I made a grilled cheese sandwich.
I made a veggie sandwich.
7-9: No Pastrami
Using the list sandwich_orders from Exercise 7-8, make sure the sandwich 'pastrami' appears in the list at least three times. Add code near the beginning of your program to print a message saying the deli has run out of pastrami, and then use a while loop to remove all occurrences of 'pastrami' from sandwich_orders. Make sure no pastrami sandwiches end up in finished_sandiches.
sandwich_orders = [
'pastrami', 'veggie', 'grilled cheese', 'pastrami',
'turkey', 'roast beef', 'pastrami']
finished_sandwiches = []
print("I'm sorry, we're all out of pastrami today.")
while 'pastrami' in sandwich_orders:
sandwich_orders.remove('pastrami')
print("\n")
while sandwich_orders:
current_sandwich = sandwich_orders.pop()
print(f"I'm working on your {current_sandwich} sandwich.")
finished_sandwiches.append(current_sandwich)
print("\n")
for sandwich in finished_sandwiches:
print(f"I made a {sandwich} sandwich.")
Output:
I'm sorry, we're all out of pastrami today.
I'm working on your roast beef sandwich.
I'm working on your turkey sandwich.
I'm working on your grilled cheese sandwich.
I'm working on your veggie sandwich.
I made a roast beef sandwich.
I made a turkey sandwich.
I made a grilled cheese sandwich.
I made a veggie sandwich.
7-10: Dream Vacation
Write a program that polls users about their dream vacation. Write a prompt similar to If you could visit one place in the world, where would you go? Include a block of code that prints the results of the poll.
name_prompt = "\nWhat's your name? "
place_prompt = "If you could visit one place in the world, where would it be? "
continue_prompt = "\nWould you like to let someone else respond? (yes/no) "
# Responses will be stored in the form {name: place}.
responses = {}
while True:
# Ask the user where they'd like to go.
name = input(name_prompt)
place = input(place_prompt)
# Store the response.
responses[name] = place
# Ask if there's anyone else responding.
repeat = input(continue_prompt)
if repeat != 'yes':
break
# Show results of the survey.
print("\n--- Results ---")
for name, place in responses.items():
print(f"{name.title()} would like to visit {place.title()}.")
Output:
What's your name? eric
If you could visit one place in the world, where would it be? china
Would you like to let someone else respond? (yes/no) yes
What's your name? erin
If you could visit one place in the world, where would it be? iceland
Would you like to let someone else respond? (yes/no) yes
What's your name? ever
If you could visit one place in the world, where would it be? japan
Would you like to let someone else respond? (yes/no)
--- Results ---
Eric would like to visit China.
Erin would like to visit Iceland.
Ever would like to visit Japan.