save project

diy1.py

 username = "python"    
 username = "python"    
 userpassword = "123456"
 userpassword = "123456"
+while True:
+    a_1=input ("请输入账号:")# 请用input()实现用户输入账号、密码的功能
+    a_2=input("请输入密码:") 
+    if a_1==username and a_2==userpassword:
+         print("登入成功")
+         break  
+    print("输入错误，请重新输入。")
+print("输入正确。")
 
 
-a_1=input ("请输入账号:")# 请用input()实现用户输入账号、密码的功能
-a_2=input("请输入密码:")
-if a_1==username and a_2==userpassword:
-    print("登入成功")