save project

123.py

+a="123"
+b="321"
+while True:
+    c=input("请输入用户名：")
+    d=input("请输入密码：")
+    if a==c and b==d:
+        break
+    if a!=c:
+        print("用户名错误")
+    if b!=d:
+        print("密码错误")
+    print("登录失败")
+print("登录成功")
\ No newline at end of file