Merge pull request #39 from alysivji/add-exception-chaining

Add exception chaining for both py2 and py3 using the six library

engarde/checks.py

@@ -11,6 +11,7 @@
 import numpy as np
 import pandas as pd
 import pandas.util.testing as tm
+import six
 
 from engarde import generic
 from engarde.generic import verify, verify_all, verify_any
@@ -265,8 +266,8 @@ def is_same_as(df, df_to_compare, **kwargs):
     """
     try:
         tm.assert_frame_equal(df, df_to_compare, **kwargs)
-    except AssertionError as e:
-        raise AssertionError("DataFrames are not equal")
+    except AssertionError as exc:
+        six.raise_from(AssertionError("DataFrames are not equal"), exc)
     return df
 
 

requirements.txt

@@ -1,2 +1,3 @@
 numpy>=1.8
 pandas>=0.16.2
+six>=1.10.0

setup.py

@@ -34,7 +34,7 @@
 
     keywords='data analysis',
     packages=find_packages(exclude=['tests']),
-    install_requires=['numpy', 'pandas'],
+    install_requires=['numpy', 'pandas', 'six'],
 
     # List additional groups of dependencies here (e.g. development
     # dependencies). You can install these using the following syntax,