df = pd.DataFrame(  # doctest: +SKIP
    np.random.randint(1, 7, 6000),
    columns = ['one'])
df['two'] = df['one'] + np.random.randint(1, 7, 6000)  # doctest: +SKIP
ax = df.plot.hist(bins=12, alpha=0.5)  # doctest: +SKIP