if嵌套if的先后顺序的区别(自测)

 1 while 1:
 2     username = input("请输入用户名").capitalize()
 3     password = input("请输入密码:").upper()
 4     #  verify_code = input("请输入验证码: ").capitalize()
 5     if username == "Jack" and password == "2018":
 6         verify_code = input("请输入验证码: ").capitalize()
 7         if verify_code == "Utf8":
 8             print("登录成功.")
 9             break
10         else:
11             print("验证码错误")
12     else:
13         print("用户名或者密码错误.")

 1 while 1:
 2     user_ming = input("请输入用户名:")
 3     user_mima = input("请输入密码: ")
 4     veri_co = input("请输入验证码:")
 5     if veri_co == "TXT":
 6         if user_ming == "瓜瓜" and user_mima == "007":
 7             print("登陆成功")
 8             break
 9         else:
10             print("用户名或密码错误")
11     else:
12         print("验证码错了")