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what we cannot do with external data in quantopian compared to internal data?

Hi everyone,

I am new to quantopian, and intend to run external data with quantopian. After encountering lots of small difficulties of applying functions to external data, I wonder is it intended that there is little can be done to external data in quantopian?

also, can anyone point out the link to source code of fetch_csv in github? It appears quite hard to locate.

Thanks a lot

1 response

Hi Kenny,

The complete list of functions compatible with Fetcher data can be found here. Given that Fetcher can be used to import a variety of types of information, it's not always feasible to make every builtin function compatible with it. Hopefully that reference list helps.

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