quantopian / zipline / 4062

88%

master: 88%

Pull #686

travis-ci

MAINT: Removes the ability to reference a global TradingEnvironment

This commit removes the ability to reference a shared TradingEnvironment through the zipline.finance.trading module. In place, the classes that require a TradingEnvironment, or its child AssetFinder, contain their own references to those objects.

This commit also adds serialization utilities that allow for the pickling/unpickling of objects without unintentionally their TradingEnvironments or AssetFinders.

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