Pandas dataframe with centered bar

df_plot_bar_2.py

import string

from pandas import DataFrame, Series
from numpy.random import randn
import matplotlib.pyplot as plt

df = DataFrame(randn(7, 4),
               index=list(string.ascii_letters[:7]),
               columns=['x', 'y', 'z', 'four'])
series = Series(randn(7), index=range(7))

fig, axes = plt.subplots(1, 4, figsize=(14, 3))
plt.subplots_adjust(top=0.9, bottom=0.1, left=0.05, right=0.95, hspace=0.35)

df.plot(kind='bar', title='Default(center)', ax=axes[0], legend=False)
series.plot(ax=axes[0])

df.plot(kind='bar', stacked=True, title='Default(center)', ax=axes[1], legend=False)
series.plot(ax=axes[1])

df.plot(kind='bar', title='Align=edge', ax=axes[2], legend=False, align='edge')
series.plot(ax=axes[2])

df.plot(kind='bar', stacked=True, title='Align=edge', ax=axes[3], legend=False, align='edge')
series.plot(ax=axes[3])

plt.show()

Example for
pandas-dev/pandas#6691