import plotly.plotly as py
import plotly.tools as tls

import pylab as plt

fig = plt.figure()

x = 0.25*plt.randn(1000)
y = 0.3*plt.randn(1000)
n, bins, patches = plt.hist([x, y])

plotly_fig = tls.mpl_to_plotly( fig )
py.iplot(plotly_fig, filename='mpl-multi-histogram')