python plt show legend

1import numpy as np
2import matplotlib.pyplot as plt
3
4def example_legend():
5    plt.clf()
6    x = np.linspace(0, 1, 101)
7    y1 = np.sin(x * np.pi / 2)
8    y2 = np.cos(x * np.pi / 2)
9    plt.plot(x, y1, label='sin')
10    plt.plot(x, y2, label='cos')
11    plt.legend()
12