标签：put nbsp logs arp use 无限 跳出循环 user 完全
循环的终止语句
break #用于完全结束一个循环，跳出循环体执行循环后面的语句
continue #只终止本次循环，接着执行后面的循环
1. 打印0-100，截止到第6次
count = 0
while count <= 100:
print(‘Value: ‘, count)
if count == 5:
break
count += 1
2. 打印0-100，截止到第6次，第6次无限循环打印
count = 0
while count <= 100:
print(‘Value: ‘, count)
if count == 5:
continue
count += 1
3. 打印1-5，95-101
count = 0
while count <= 100:
count += 1
if count > 5 and count < 95:
continue
print(‘Value: ‘, count)
4. 猜年龄，允许用户猜三次，中间猜对跳出循环
count = 0
age =18
while count < 3:
user_guess = int(input(‘Input Number: ‘))
if user_guess == age:
print(‘Yes, you are right!‘)
break
elif user_guess > age:
print(‘Try smaller!‘)
else:
print(‘Try bigger!‘)
count += 1
5. 猜年龄，允许用户猜三次，中间猜对跳出循环，猜了三次后若没有猜对，询问是否继续，Y则继续，N则结束
count = 0
age =18
while count < 3:
user_guess = int(input(‘Input Number: ‘))
if user_guess == age:
print(‘Yes, you are right!‘)
break
elif user_guess > age:
print(‘Try smaller!‘)
else:
print(‘Try bigger!‘)
count += 1
if count == 3:
choice = input(‘Whether or not to continue?(Y/N): ‘)
if choice == ‘Y‘ or choice == ‘y‘:
count = 0
elif choice == ‘N‘ or choice == ‘n‘:
pass
else:
print(‘You must input Y/y or N/n !‘)
pass
while ... else语法
当while循环正常执行完毕，中间没有被break中止，就会执行else后面的语句
count = 0
while count <= 100:
print(‘Value: ‘, count)
if count == 5:
break #有break时，else下面的内容就不打印，没有break时，就打印。
count += 1
else：
print(‘loop is done.‘)
else语法可用于判断while程序中间是否被break中断跳出
标签：put nbsp logs arp use 无限 跳出循环 user 完全
原文地址：http://www.cnblogs.com/vurtne-lu/p/7805442.html
