Fixed linting errors

Author: cbertinato

pandas/tests/series/test_constructors.py

@@ -5,7 +5,6 @@
 
 from datetime import datetime, timedelta
 from collections import OrderedDict
-import types
 
 from numpy import nan
 import numpy as np
@@ -23,7 +22,6 @@
 from pandas._libs import lib
 from pandas._libs.tslib import iNaT
 
-from pandas import compat
 from pandas.compat import lrange, range, zip, long
 from pandas.util.testing import assert_series_equal
 import pandas.util.testing as tm