cleanups

core.py

 #! /usr/bin/env python
 # -*- coding: utf-8 -*-
 
-from math import ceil, isnan
+from math import ceil
 
 import numpy as np
 import pandas as pd

test/test_core.py

@@ -39,5 +39,4 @@ def testTemporalPartitioning():
 
 
 if __name__ == "__main__":
-
     testTemporalPartitioning()