save project

diy2.py

+username = "python"
+userpassword = "123456"
+while True:
+    a = input("请输入用户名:")
+    b = input("请输入密码:")
+    if a == username and b == userpassword:
+        print("登录成功!")
+        break
+    else:
+        if a !=username:
+            print("账号输入错误")
+            continue
+        elif b !=userpassword:
+            print("密码输入错误")