五、python——用户输入和while循环

# 函数input() 让程序暂停运行，等待用户输入一些文本。
# 获取用户输入后，Python将其存储在一个变量中，以方便你使用
message = input("Tell me something, and I will repeat it back to you: ")
print(message)
name = input("Please enter your name: ")
print("Hello, " + name + "!")
# 输入数字，输出是字符串
age = input("how old are you?")
print(age)
age = int(age)
print(age > 18)

# 使用while循环
current_number = 1
while current_number <= 5:
    print(current_number)
    current_number += 1

prompt = "\nTell me something, and I will repeat it back to you: "
prompt += "\nEnter 'quit' to end the program."
message = ""
while message != 'quit':
    message = input(prompt)
    if message != 'quit':
        print(message)

# 以while True 打头的循环（见❶）将不断运行，直到遇到break 语句
prompt = "\nTell me something, and I will repeat it back to you: "
prompt += "\nEnter 'quit' to end the program."
while True:
    message = input(prompt)
    if message != 'quit':
        print(message)
    else:
        break
# continue跳出本次循环
current_number = 0
while current_number < 10:
    current_number += 1
    if current_number % 2 == 0:
        continue
    else:
        print(current_number)

prompt = "\nAge: "
while True:
    message = input(prompt)
    if message == 'quit':
        break
    elif int(message) < 3:
        print('free')
    elif int(message) <= 12:
        print(10)
    else:
        print(15)

# 在列表之间移动元素
unconfirmed_users = ['alice', 'brian', 'candace']
confirmed_users = []
while unconfirmed_users:
    current_user = unconfirmed_users.pop()
    confirmed_users.append(current_user)
print("the following users have been confirmed: ")
for confirmed_user in confirmed_users:
    print(confirmed_user.title())

# 删除包含特定值的所有列表元素
pets = ['dogs', 'cat', 'pig', 'cat', 'rabbit', 'cat']
print(pets)
while 'cat' in pets:
    pets.remove('cat')
print(pets)

# 使用用户输入来填充字典
responses = {}
polling_active = True
while polling_active:
    name = input("what is your name? ")
    response = input("which mountain would you like to climb someday? ")
    responses[name] = response
    repeat = input("any one else? ")
    if repeat == 'no':
        polling_active = False
for name, response in responses.items():
    print(name + ' would like to climb ' + response + '.')