5 用户输入和while循环

5.1 函数input()工作原理

# 变量=input(参数：说明/提示)
message input("Tell me something,and I will repeat it back to you:"
print(message)

prompt ="If you tell us who you are,we can personalize the messages you see."
# prompt=prompt+"\nWhat is your first name.?"的简写（好用）
prompt += "\nWhat is your first name?
name = input(prompt)
print(f"\nHello,{name}!")

 5.2 while

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

5.3 使用while循环处理列表和字典

#首先，创健一个末验证用户列婊
#和一个用于存储已验证用户的空列表
unconfirmed_users ['alice','brian','candace']
confirmed_users =[
#验证每个用户，直到没有末验证用户为止。
#将每个经定过验证的用户都移到已验证用户列表中
while unconfirmed_users:
    current_user unconfirmed_users.pop（）
    print(f"Verifying user:(current_user.title（）)")
    confirmed_users.append(current_user)
#显示所有已验证的用户。
print("nThe following users have been confirmed:"
for confirmed_user in confirmed_users:
    print(confirmed_user.title（）)

# 删除为特定值的所有的列表元素
pets ['dog','cat','dog','goldfish','cat','rabbit','cat']
print(pets)

while 'cat'in pets:
	pets.remove('cat')

# 使用用户输入来填充字典
#创健1个空字典
responses ={}
#设置一个标志，指出调查是否继续。只要为True,pythona就运行whie循环中的/代码
polling_active True
while polling_active:
	name input("\nWhat is your name?"
	mountain_name input("Which mountain would you like to climb someday?")
	responses[name]mountain_name
	repeat input("Would you like to let another person respond?(yes/no)")
	if repeat =='no':
		polling_active False
#调查结束，显示结果
print("\n--Poll Results--")
for name,mountain_name in responses.items（）:# 字典属于不可迭代对象，需要加items才能在for中循环
	print(f"{name}would like to climb {mountain_name}.")