get or set the x limits of the current axes.

xmin, xmax = xlim()   # return the current xlim

xlim( (xmin, xmax) )  # set the xlim to xmin, xmax

xlim( xmin, xmax )    # set the xlim to xmin, xmax<paste>

change x-axis limits

import matplotlib.pyplot as plt

w = 4

h = 3

d = 70

plt.figure(figsize=(w, h), dpi=d)

x = [1, 2, 4, 3, 0]

plt.xlim(0, 10)

plt.plot(x)

plt.savefig("out.png")