save project

diy2.py

 username = "python"
 username = "python"
 userpassword = "123456"
 userpassword = "123456"
 while True:
 while True:
-    name = input("请输入用户名:")
-    password = input("请输入密码:")
-    if name == username and password == userpassword:
-        print("登录成功!")
-        break
-    print("用户名和密码错误!请重新输入")
+    name = input("请输入用户名:") 
+    if name != username:     
+        print("用户名错误!请重新输入")
+    else:
+        password = input("请输入密码:")
+        if password != userpassword:
+            print("用户名密码错误!请重新输入")
+        else:
+            print("登录成功")
+            break
 print("欢迎来到贝尔编程!")
 print("欢迎来到贝尔编程!")
\ No newline at end of file