第一周作业：密码登录

_username = "ArthurLando"
_password = "ahym12345"
username = input("username:")
for i in range(3):
password = input("password:")
  if password == _password:
    print("Welcome"+username+"!")
    break
  else:
    print("Invlid username or password!")
else:
print("You have tried too many times,fuck off...")