python学习笔记:第七章 用户输入和while循环
2017-04-09
python学习笔记:第七章 用户输入和while循环
input()
message = input("Tell me something, and I will repeat it back to you:")
print(message)
name = input("Please enter your name: ")
print("Hello," + name + "!")
prompt = "If you tell us who you are, we can personalize the messages you see."
prompt += "\nWhat is your first name?"
name = input(prompt)
print("\nHello," + name + "!")
使用input()来获取数值输入
height = input("How tall are you, in inches?")
height = int(height)
if height >= 36:
print("\nYou're tall enough to ride!")
else:
print("\nYou'll be able to ride when you're a little older.")
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)
使用标志
prompt = "\nTell me something, and I will repeat it back to you:"
prompt += "\nEnter 'quit' to end the program."
active = True
while active:
message = input(prompt)
if message == 'quit':
active = False
else:
print(message)
使用break退出循环
prompt = "\nTell me something, and I will repeat it back to you:"
prompt += "\nEnter 'quit' to end the program."
while True:
city = input(prompt)
if city == 'quit':
break
else:
print("I'd love to go to " + city.title() + "!")
在循环中使用continue
current_number = 0
while current_number < 10:
current_number +=1
if current_number % 2 == 0:
continue
print(current_number)
在列表直接移动元素
unconfirmed_users = ['alice', 'brain','candace']
confirmed_users = []
while unconfirmed_users:
current_user = unconfirmed_users.pop()
print("Verifying user:" + current_user.title())
confirmed_users.append(current_user)
print("\nThe following users have been confirmed:")
for confirmed_user in confirmed_users:
print(confirmed_user.title())
删除包含特定值得所有列表元素
pets = ['dog', 'cat', 'dog', 'goldfish', '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("\nWhat 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("\n--- Poll Results ---")
for name, response in responses.items():
print(name + "would like to climb " + response + ".")