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DOC: Weaker modality for history in initialize.

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`history` works, with some caveats, in before_trading_start as well.
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Scott Sanderson committed 2015-10-27 14:38:26 -04:00
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commit 114c3d3bdf
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zipline/errors.py
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@@ -195,7 +195,7 @@ class HistoryInInitialize(ZiplineError):
"""
Raised when an algorithm calls history() in initialize.
"""
msg = "history() can only be called in handle_data()"
msg = "history() should only be called in handle_data()"
class MultipleSymbolsFound(ZiplineError):