How to plot a superimposed bar chart using matplotlib in python?

Question

I want to plot a bar chart or a histogram using matplotlib. I don\'t want a stacked bar plot, but a superimposed barplot of two lists of data, for instance I have the follow

Answer 1

It is actually simpler than the answers all over the internet make it appear.

a = range(1,10)
b = range(4,13)
ind = np.arange(len(a))

fig = plt.figure()
ax = fig.add_subplot(111)
ax.bar(x=ind, height=a, width=0.35,align='center')
ax.bar(x=ind, height=b, width=0.35/3,  align='center')

plt.xticks(ind, a)

plt.tight_layout()
plt.show()