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DOC: Update NullFilter docstring.

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Scott Sanderson
2016-03-07 16:41:50 -05:00
parent f635a14289
commit abe559c764
1 changed files with 3 additions and 3 deletions
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zipline/pipeline/filters/filter.py
+3 -3
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@@ -176,12 +176,12 @@ class NumExprFilter(NumericalExpression, Filter):
class NullFilter(SingleInputMixin, Filter):
"""
A Filter indicating whether an input input values are missing.
A Filter indicating whether input values are missing from an input.
Parameters
----------
factor zipline.pipeline.factor.Factor
The factor to compare with null.
factor : zipline.pipeline.factor.Factor
The factor to compare against its missing_value.
"""
window_length = 0