save project

diy2.py

+n = "python"
+u = "123456"
+while True:
+    n1 = input("请输入账号:")
+    u1 = input("请输入密码:")
+    if n1 == n and u1 == u:
+        print("登录成功!")
+        break
+    else:
+        if n1 != n:
+            print("账号错误!")
+            continue
+        if u1 != u:
+            print("密码错误!")
+