save project

1.py

+username="python"
+userpassword="123456"
+while True:
+    name=input("请输入用户名:")
+    password =input("请输入:")
+    if name == usernameand and password ==userpassword:
+        print("登录成功")
+        break
+    elif name !=username:
+        print("用户名不存在")
+    else:
+        print("密码输入有误，请重新输入！")
+print("欢迎来到贝尔编程")
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