save project

diy2.py

@@ -2,12 +2,13 @@ username = 'python'
 userpassword = "123456"
 userpassword = "123456"
 while True:
 while True:
     a=input('输入账号:')
     a=input('输入账号:')
+    if a != username:
+        print("用户名错误！请重新输入")
+        continue
     b=input('输入密码:')
     b=input('输入密码:')
     if a==username and b==userpassword:
     if a==username and b==userpassword:
         input("登录成功:")
         input("登录成功:")
         break
         break
-    if a != username:
-        print("用户名错误！请重新输入")
     if b != userpassword:
     if b != userpassword:
         print("密码错误!请重新输入")
         print("密码错误!请重新输入")
 print("欢迎来到贝尔编程!:")
 print("欢迎来到贝尔编程!:")
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