Possibly deal with a good chunk of the old_divs

SimPEG/Examples/MT_1D_ForwardAndInversion.py

@@ -4,7 +4,6 @@ from __future__ import print_function
 from __future__ import absolute_import
 from future import standard_library
 standard_library.install_aliases()
-from past.utils import old_div
 import SimPEG as simpeg
 import numpy as np
 import SimPEG.MT as MT
@@ -91,7 +90,7 @@ def run(plotIt=True):
     std = 0.05 # 5% std
     survey.std = np.abs(survey.dobs*std)
     # Assign the data weight
-    Wd = old_div(1.,survey.std)
+    Wd = 1./survey.std
 
     ## Setup the inversion proceedure
     # Define a counter