py-text11
用户登录（三次机会）每次输错显示剩余机会，循环中的break和continue
username=’xiaoz’
password=’123’
i=1
while i<=3:
name=input(‘username: ‘)
pwd=input(‘password: ‘)
if username==name and password==pwd:
print(‘login successful!!!’)
break
else:
print(‘login failed %s times only’ %(3-i))
if (3-i)==0:
result=input(‘try again? yes?：’)
if result==’yes’ or result==’y’ :
i=1
continue
i+=1
else:
print(‘Get out’)