import numpy as np
import matplotlib.pyplot as plt

N=5
menmeans=(20,35,30,35,27)
womenmeans=(25,32,41,27,30)
ind=np.arange(N)
width=0.32

fig=plt.figure(figsize=(9,7),dpi=120,facecolor='w')
ax=fig.add_subplot(111)
rects1=ax.bar(ind,menmeans,width,color='r')  
rects2=ax.bar(ind+width,womenmeans,width,color='y')

ax.set_xticks(ind+width)
ax.set_xlim([-0.5,5])
leg=ax.legend((rects1[0],rects2[0]),('men','women'),fancybox=True)
# set the alpha value of the legend: it will be translucent
leg.get_frame().set_alpha(0.5)  

def autoplot (rects):
    # attach some text labels
    for rect1,rect2  in rects:
        height1=rect1.get_height()
        height2=rect2.get_height()
        plt.plot([rect1.get_x()+rect1.get_width()/2.,rect2.get_x()+rect2.get_width()/2.],[height1,height2], lw=6.0)
            
autoplot(zip(rects1,rects2))
plt.savefig("bar_chart_new.png",dpi=200)
plt.show()