Matplotlib--legend

顯示圖例

import matplotlib.gridspec as gridspec
from mpl_toolkits.mplot3d import Axes3D

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.ticker import MultipleLocator, FormatStrFormatter

# 生成X數據
x_data = np.linspace(-2,2,50)
# Y數據
y1 = np.sin(10*x_data)*np.exp(-x_data) - 0.5
y2 = np.square(x_data)

l1, = plt.plot(x_data, y1, c='r', lw=2, ls = '-.')
l2, = plt.plot(x_data, y2, c='g')

plt.xlabel('X')
plt.ylabel('Y')


plt.legend(handles=[l1, l2], labels=['$sin(x)*exp(x)$', '$x^2$'])

plt.savefig('d:/f.png')
plt.show()