MAINT/STY: Upgrade flake8 and fix new failures.

tests/calendars/test_trading_calendar.py

@@ -35,10 +35,10 @@ from zipline.errors import (
 )
 
 from zipline.testing.predicates import assert_equal
-from zipline.utils.calendars import(
-    register_calendar,
+from zipline.utils.calendars import (
     deregister_calendar,
     get_calendar,
+    register_calendar,
 )
 from zipline.utils.calendars.calendar_utils import (
     _default_calendar_aliases,

tests/pipeline/test_term.py

@@ -71,6 +71,7 @@ class SomeFactor(Factor):
     window_length = 5
     inputs = [SomeDataSet.foo, SomeDataSet.bar]
 
+
 SomeFactorAlias = SomeFactor
 
 

tests/resources/pipeline_inputs/generate.py

@@ -37,5 +37,6 @@ def main():
         print("Writing %s -> %s" % (symbol, dest))
         data.to_csv(dest, index_label='day')
 
+
 if __name__ == '__main__':
     main()

tests/test_execution_styles.py

@@ -15,9 +15,7 @@
 from nose_parameterized import parameterized
 from six.moves import range
 
-from zipline.errors import(
-    BadOrderParameters
-)
+from zipline.errors import BadOrderParameters
 from zipline.finance.execution import (
     LimitOrder,
     MarketOrder,

tests/test_restrictions.py

@@ -25,6 +25,7 @@ from zipline.testing.fixtures import (
 def str_to_ts(dt_str):
     return pd.Timestamp(dt_str, tz='UTC')
 
+
 FROZEN = RESTRICTION_STATES.FROZEN
 ALLOWED = RESTRICTION_STATES.ALLOWED
 MINUTE = pd.Timedelta(minutes=1)