save project

diy1.py

 A="1234567890"
 B="0987654321"
-C=input("用户名:")
-D=input("密码:")
-if C==A and B==D:
+while True:
+    C=input("用户名:")
+    D=input("密码:")
+    if C==A and B==D:
         print("登陆成功")
-else:
-    print("用户名或密码错误")    
\ No newline at end of file
+        break
+    else:
+        if C!=A:
+            print("登陆失败")
+        elif D!=B:
+            print("密码失败")    
+        else:
+            print("密码或登陆失败") 
+