Prints differences between two given DataFrame's

dataframe_diff.py

import numpy as np
import pandas as pd

def df_diff(df1, df2):
    # Extracted from
    # http://stackoverflow.com/a/17095620
    diffs = df1 != df2
    ne_stacked = diffs.stack()

    changed = ne_stacked[ne_stacked]
    changed.index.names = ['id', 'col']

    difference_locations = np.where(diffs)

    changed_from = df1.values[difference_locations]
    changed_to   = df2.values[difference_locations]

    print(pd.DataFrame({'from': changed_from, 'to': changed_to}, index=changed.index))