stockranker报错TypeError: '<' not supported between instances of 'NoneType' and 'int'
由dandelion4创建，最终由dandelion4 被浏览 11 用户
请教：报TypeError: '<' not supported between instances of 'NoneType' and 'int'是什么原因？
https://bigquant.com/codesharev3/3133fbc3-5ff7-48c9-af49-38abbf0442ec
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