right_2014_target = pd.DataFrame({'month': ['jan', 'feb', 'mar', 'apr',
    'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec'],
    '2014_target_val': [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]})
df_13_14 = pd.merge(left_2013, right_2014, how='outer')
df_13_14_target = pd.merge(df_13_14, right_2014_target, how='outer')
ax = df_13_14_target[['month', '2014_target_val']].plot(x='month',
    linestyle='-', marker='o')
df_13_14_target[['month', '2013_val', '2014_val']].plot(x='month', kind=
    'bar', ax=ax)
plt.show()
Постройте Pandas DataFrame как гистограмму и линию на одном графике