python while 7

1. 简单的while示例

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

 

2.使用标志

active=True
num =1
num_end=10
while active:
    print(num)
    num+=1
    if num>num_end:
        active=False

 3.使用break 退出循环

active=True
num =1
num_end=10
while active:
    print(num)
    num+=1
    if num>num_end:
        break
    

　　打印效果与上图一样

4.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)

 

 　　备注：在Sublime Text等一些编辑器，不小心使用程序无限循环时，再按Ctrl + C，这样应该能够结束无限循环。

 5. while处理列表

# 列表使用whlie ，在列表之间移动元素
unconfirmed_users = ['alice', 'brian', 'candace']
confirmed_users = []

while unconfirmed_users:
    current_user=unconfirmed_users.pop()

    print (F'Verifying user:{current_user.title()}')
    confirmed_users.append(current_user)

for user in confirmed_users:
    print(user.title())　　

#删除列表中指定元素
pets = ['dog', 'cat', 'dog', 'goldfish', 'cat', 'rabbit', 'cat']
while 'cat' in pets:
    pets.remove('cat')
print(pets)

6.while 处理字典

#字典使用whlie ，在字典之间移动元素
unconfirmed_users = {'name':['alice', 'brian', 'candace']}
confirmed_users={}

while unconfirmed_users['name']:
    current_user=unconfirmed_users['name'].pop()

    print(f"Verifying user: {current_user.title()}")

    if confirmed_users.get('name')==None:
         confirmed_users['name']=[current_user]
    else:
         confirmed_users['name'].append(current_user)
       
    
for confirmed_user in confirmed_users['name']:
      print(confirmed_user.title())