Lists - Strings

Objective

After working through this lesson, you’ll be able to

• Write Python code using lists.

Video Lecture

Introductory Problem

Create a list of 3 of your friends. Print the list using a for loop.

intro.py

done = False
friends = ["Sofia", "Alex", "Sam"]
while not done:
    print("Menu")
    print("I - Introduction")
    print("Q - Quit")
    choice = input("Choice: ")
    if choice == "I":
        print("Introductory Problem")
        for f in friends:
            print(f)
    elif choice == "Q":
        print("Quitting")
        done = True

Examples

Example 1

You make a new friend named “Chaya” on the bus ride. Add this friend to the end of the list. Print the list using a for loop.

done = False
friends = ["Sofia", "Alex", "Sam"]
while not done:
    print("Menu")
    print("E1 - Example 1")
    print("Q - Quit")
    choice = input("Choice: ")
    if choice == "E1":
        print("Example 1")
        friends.append("Chaya")
        for pal in friends:
            print(pal)
    elif choice == "Q":
        print("Quitting")
        done = True

Example 2

One of your friends moves away. Ask the user for the friend's name. Delete this friend. Print the list using a for loop.

done = False
friends = ["Sofia", "Alex", "Sam"]
while not done:
    print("Menu")
    print("E2 - Example 2")
    print("Q - Quit")
    choice = input("Choice: ")
    if choice == "E2":
        print("Example 2")
        friends.pop(0)
        for pal in friends:
            print(pal)
    elif choice == "Q":
        print("Quitting")
        done = True

Example 3

You make new friends riding the bus. Ask the user for a new friend 3 times. Using a for loop, print the list of friends. Print the total number of friends.

done = False
friends = ["Sofia", "Alex", "Sam"]
while not done:
    print("Menu")
    print("E3 - Example 3")
    print("Q - Quit")
    choice = input("Choice: ")
    if choice == "E3":
        print("Example 3")
        for x in range(3):
            name = input("New Friend: ")
            friends.append(name)
        for f in friends:
            print(f)
        print("Number of Friends:",len(friends))
    elif choice == "Q":
        print("Quitting")
        done = True