fix(pandas): pandas-0.20.1 dropped PandasError class.

+ See pydata/pandas-datareader#305

Author: ankostis

wltp/model.py

@@ -30,7 +30,6 @@
 from jsonschema import (RefResolver, ValidationError)
 import jsonschema
 from numpy import ndarray
-from pandas.core.common import PandasError
 from pandas.core.generic import NDFrame
 from six import string_types
 from wltp.cycles import (class1, class2, class3)
@@ -41,6 +40,13 @@
 import operator as ops
 import pandas as pd
 
+try:
+    from pandas.core.common import PandasError
+except ImportError:
+    ## Pandas-0.20.1 dropped this classs.
+    #  See https://github.com/pydata/pandas-datareader/issues/305
+    PandasError = ValueError
+
 
 log = logging.getLogger(__name__)
 

wltp/test/experiment_ForcedCycle.py

@@ -13,14 +13,19 @@
 from wltp.experiment import Experiment
 from wltp.test.goodvehicle import goodVehicle
 
-from pandas.core.common import PandasError
-
 import numpy as np
 import numpy.testing as npt
 import pandas as pd
 
 from ..utils import assertRaisesRegex
 
+try:
+    from pandas.core.common import PandasError
+except ImportError:
+    ## Pandas-0.20.1 dropped this classs.
+    #  See https://github.com/pydata/pandas-datareader/issues/305
+    PandasError = ValueError
+
 
 class TestForcedCycle(unittest.TestCase):
     def setUp(self):