quantopian / zipline / 10599

88%

master: 88%

Pull #2597

travis-ci

BUG: Clarify bases type for currency queries.

- Rather than using numpy's S3 and U3 types, which behave differently in py2
  and py3, just expect object arrays of `str` everywhere.

  This makes it slightly more expensive for us to read the currency index from
  the file in py3, but that array is on the order of a hundred or so elements
  total, so that's not a major concern, and it simplifies the handling
  elsewhere.

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