for循环、break语句

# for i in range(1,101):
# if i % 2 == 1:
# print("loop:",i)
# for i in range(100):
# if i < 50 or i > 70:
# print(i)

#
# for i in range(1,101,2): #2 步长
# print("loop:",i)

_user ="alex"
_passwd = "abc123"

# for i in range(3):
# username = input("Username:")
# password = input("Password:")
# if username == _user and password == _passwd :
# print("Welcome %s login...." % _user)
# break #跳出，中断
# else:
# print("Invalid username or password !")
# else:
# print("要不要脸，臭流氓啊，小虎。")

passed_authentication = False #假，不成立

for i in range(3):
username = input("Username:")
password = input("Password:")
if username == _user and password == _passwd :
print("Welcome %s login...." % _user)
passed_authentication = True #，真，成立
break #跳出，中断
else:
print("Invalid username or password !")
if not passed_authentication:#只有在True的情况下，条件成立
print("要不要脸，臭流氓啊，小虎。")

_uasemane = "gsk"
_password = "123a"
for i in range(3):
    username = input("请输入账号：")
    password = input("请输入密码：")
    if username == _uasemane and password == _password:
        print("爱你 %s login...." %_uasemane)
        break
    else:
        print("账号或密码错误，请重新输入")
else:
    print("输入次数超过三次，冻结半小时"