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from matplotlib.widgets import Cursor

import numpy as np

import matplotlib.pyplot as plt

fig = plt.figure(figsize=(8, 6))

ax = fig.add_subplot(111, facecolor='#FFFFCC')

x, y = 4*(np.random.rand(2, 100) - .5)

ax.plot(x, y, 'o')

ax.set_xlim(-2, 2)

ax.set_ylim(-2, 2)

# set useblit = True on gtkagg for enhanced performance

cursor = Cursor(ax, useblit=True, color='red', linewidth=2)

plt.show()