save project

diy2.py

+username = "python"
+userpassword = "123456"
+while True:
+    name = input("请输入用户名:")
+    if name != username:
+        print("没有此账号")
+    else:
+        password = input("请输入密码:")
+        if password != userpassword:
+            print("不匹配")
+        else:
+            print("登录成功!")
+            break
+        print("用户名和密码错误!请重新输入")
+print("欢迎来到贝尔编程!")
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