for 循环适合以[读]方式遍历列表；while 循环适合以[读写]方式 遍历列表。
1. 在列表之间移动元素
#首先创建一个未确认列表
unconfirmed_users=['alice','brian','candace']
#然后创建一个已确认空列表
confirmed_users=[]
while unconfirmed_users:
#将未确认列表删除最后一个元素并返回值，赋值给遍历current_user
current_users=unconfirmed_users.pop()
print("Verifing user:"
+current_users.title())
#将未确认列表删除的元素添加到已确认列表
confirmed_users.append(current_users)
print("The following users have been comfirmed:")
#打印已确认列表的元素
for confirmed_user in confirmed_users:
print(confirmed_user.title())
2.删除包含特定值得所有列表元素
remove()只是删除列表最先出现的元素，如果列表中有重复的元素，可以用while 循环删除列表的元素
pets=['dog','cat','dog','goldfish','cat','rabbit','cat']
print(pets)
while 'cat' in pets:
pets.remove('cat')
print(pets)
3.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("\nWhich mountain would you like to climb someday?")
#将答案存储在字典中，键是name变量，值是response变量
responses[name]=response
repeat=input("\n Would you like to let another people respond?(yes/no)")
if repeat=='no':
#修改控制循环条件值，为False时结束循环
polling_active=False
print("\n--Poll resules--")
for name,responses in responses.items():
print(name+" would like to climb "+responses)
