def setUp(self):
self.constants = {
# Every day, assume every stock starts at 2, goes down to 1,
# goes up to 4, and finishes at 3.
USEquityPricing.low: 1,
USEquityPricing.open: 2,
USEquityPricing.close: 3,
USEquityPricing.high: 4,
}
self.asset_ids = [1, 2, 3, 4]
self.dates = date_range('2014-01', '2014-03', freq='D', tz='UTC')
self.loader = PrecomputedLoader(
constants=self.constants,
dates=self.dates,
sids=self.asset_ids,
)
self.asset_info = make_simple_equity_info(
self.asset_ids,
start_date=self.dates[0],
end_date=self.dates[-1],
)
environment = TradingEnvironment()
environment.write_data(equities_df=self.asset_info)
self.asset_finder = environment.asset_finder
self.assets = self.asset_finder.retrieve_all(self.asset_ids)
def init_class_fixtures(cls):
super(ConstantInputTestCase, cls).init_class_fixtures()
cls.constants = {
# Every day, assume every stock starts at 2, goes down to 1,
# goes up to 4, and finishes at 3.
USEquityPricing.low:
1,
USEquityPricing.open:
2,
USEquityPricing.close:
3,
USEquityPricing.high:
4,
}
cls.dates = date_range(
cls.START_DATE,
cls.END_DATE,
freq='D',
tz='UTC',
)
cls.loader = PrecomputedLoader(
constants=cls.constants,
dates=cls.dates,
sids=cls.asset_ids,
)
cls.assets = cls.asset_finder.retrieve_all(cls.asset_ids)
def test_rolling_and_nonrolling(self):
open_ = USEquityPricing.open
close = USEquityPricing.close
volume = USEquityPricing.volume
# Test for thirty days up to the last day that we think all
# the assets existed.
dates_to_test = self.dates[-30:]
constants = {open_: 1, close: 2, volume: 3}
loader = PrecomputedLoader(
constants=constants,
dates=self.dates,
sids=self.asset_ids,
)
engine = SimplePipelineEngine(
lambda column: loader, self.dates, self.asset_finder,
)
sumdiff = RollingSumDifference()
result = engine.run_pipeline(
Pipeline(
columns={
'sumdiff': sumdiff,
'open': open_.latest,
'close': close.latest,
'volume': volume.latest,
},
),
dates_to_test[0],
dates_to_test[-1]
)
self.assertIsNotNone(result)
self.assertEqual(
{'sumdiff', 'open', 'close', 'volume'},
set(result.columns)
)
result_index = self.asset_ids * len(dates_to_test)
result_shape = (len(result_index),)
check_arrays(
result['sumdiff'],
Series(
index=result_index,
data=full(result_shape, -3, dtype=float),
),
)
for name, const in [('open', 1), ('close', 2), ('volume', 3)]:
check_arrays(
result[name],
Series(
index=result_index,
data=full(result_shape, const, dtype=float),
),
)