Python编程从入门到实践（5）学习笔记-用户输入和while

第七章，用户输入和while循环

# 第七章 用户输入和while
message = input("Tell me sth.and I will repeat it back to you:")
print(message)

# += 拼接字符串
promt = "If you tell us who you are ,we can personalize the messages you see."
promt += "
 What is your first name"
name = input(promt)
print("
Hello ," + name + '!')

# int()
age = input("How old are you?")
print(age)

# TypeError: '>=' not supported between instances of 'str' and 'int'
# if age>=18:
#     print("over 18")

# 需要转型
if int(age) > 18:
    print("over 18")

# 求余数 求模 %
# 余数1
print(4 % 3)
# 余数2
print(5 % 3)
# 余数0
print(6 % 3)

#
number = input("Enter a number,and I'll tell you if it's even or odd")
number = int(number)
# 被2整除 是偶数
if number % 2 == 0:
    print("is even")
else:
    print("is odd")

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

# break
promt = "
Please enter the name of a city you have visited:"
promt += "
(Enter 'quit' when you are finished."

while True:
    city = input(promt)

    if city == 'quit':
        break
    else:
        print("I'd love to go to " + city.title() + "!")

# continue
current_number = 0
while current_number < 10:
    current_number += 1
    if current_number % 2 == 0:
        continue
    print(current_number)

# while 循环处理列表
unconfirmed_users = ['alice', 'brian', 'candace']
confirmed_users = []

# 参见书P78页 列表至少包含一个元素则返回True，while True继续循环
# 当列表一个元素也没有则返回False ，while False 出循环
while unconfirmed_users:
    current_user = unconfirmed_users.pop()
    print("Verifying user: " + current_user.title())
    confirmed_users.append(current_user)

# 出循环
print("
The following users have benn confirmed:")
for confirmed_user in confirmed_users:
    print(confirmed_user.title())

# 删除特定值所有列表元素
pets = ['dog', 'cat', 'dog', 'goldfish', 'cat', 'rabbit', 'cat']
print(pets)

while 'cat' in pets:
    pets.remove('cat')
# ['dog', 'dog', 'goldfish', 'rabbit']
print(pets)

# 用户输入填充字典
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("Would you like to let another person respond?(yes/no)")
    if repeat == 'no':
        polling_active = False

print("
--- Poll Results ---")
for name, response in responses.items():
    print(name + " would like to climb " + response + ".")