Python第三方库——Matplotlib_在同个figure中绘制多个图并给出legend

Python第三方库——Matplotlib_在同个figure中绘制多个图并给出legend。

import matplotlib.pyplot as plt

line1, = plt.plot([1,2,3], linestyle='--')
line2, = plt.plot([3,2,1], linewidth=4)

# Create a legend for the first line.
plt.legend([line1, line2], ["Line 1", "Line 2"], loc=1)
plt.show()