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pylab_examples example code: legend_demo2.pyΒΆ

(Source code, png, pdf)

# Make a legend for specific lines.
import matplotlib.pyplot as plt
import numpy as np

t1 = np.arange(0.0, 2.0, 0.1)
t2 = np.arange(0.0, 2.0, 0.01)

# note that plot returns a list of lines.  The "l1, = plot" usage
# extracts the first element of the list into l1 using tuple
# unpacking.  So l1 is a Line2D instance, not a sequence of lines
l1, = plt.plot(t2, np.exp(-t2))
l2, l3 = plt.plot(t2, np.sin(2 * np.pi * t2), '--o', t1, np.log(1 + t1), '.')
l4, = plt.plot(t2, np.exp(-t2) * np.sin(2 * np.pi * t2), 's-.')

plt.legend((l2, l4), ('oscillatory', 'damped'), loc='upper right', shadow=True)
plt.title('Damped oscillation')

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