import numpy as np
import matplotlib.pyplot as plt

x = np.arange(-5, 5, 0.1)
y = np.sin(x)

plt.plot(x,     y, "-",  label="-")
plt.plot(x+0.2, y, "--", label="--")
plt.plot(x+0.4, y, "-.", label="-.")
plt.plot(x+0.6, y, ":",  label=":")

plt.legend()

plt.xlim(-np.pi, np.pi)

plt.savefig("lines.png")