You can also just turn the offset off: (almost exact copy of How to remove relative shift in matplotlib axis)
import matlplotlib is plt
plt.plot([1000, 1001, 1002], [1, 2, 3])
plt.gca().get_xaxis().get_major_formatter().set_useOffset(False)
plt.draw()
This grabs the current axes, gets the x-axis axis object and then the major formatter object and sets useOffset to false (doc).