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#!/usr/bin/python
import numpy as np
import matplotlib.pyplot as plt
plt.rcParams['legend.fontsize'] = 10
fig = plt.figure ()
ax = fig.gca ()
data = np.array([
[-2, 1],
[-1,-1],
[ 0, 1],
[ 1,-1],
[ 2, 1]
])
x, y = data.T
ax.set_xticks ([-2, -1, 1, 2])
ax.spines['left'].set_position ('center')
ax.spines['right'].set_position ('center')
ax.set_yticks ([-1, -0.5, 0.5, 1])
ax.spines['top'].set_position ('center')
ax.spines['bottom'].set_position ('center')
plt.scatter (x, y, label='$y=(-1)^{x}$')
ax.legend ()
plt.show ()
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