在flask中定义了一个简单的删除数据库内容的路由
测试却发现一直报错
说delete_history函数定义时没有接受参数，但是检查delete_history函数却发现没有问题
后来想了半天才发现delete_history的路由函数名也是delete_history，那么程序就会调用路由函数而不会调用import进来的delete_history函数，从而导致这个问题
将路由函数重命名，测试成功。
千万不要写和路由函数同名的自定义函数啊！
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