matplotlib_legend

本文介绍matplotlib 中的 legend 图例，就是为了帮我们展示出每个数据对应的图像名称. 更好的让读者认识到你的数据结构.

Demo.py

import matplotlib.pyplot as plt
import numpy as np

x = np.linspace(-3, 3, 50)
y1 = 2*x + 1
y2 = x**2

plt.figure()
#set x limits
plt.xlim((-1, 2))
plt.ylim((-2, 3))

# set new sticks
new_sticks = np.linspace(-1, 2, 5)
plt.xticks(new_sticks)
# set tick labels
plt.yticks([-2, -1.8, -1, 1.22, 3],
           [r'$really\ bad$', r'$bad$', r'$normal$', r'$good$', r'$really\ good$'])
# set line syles
l1, = plt.plot(x, y2, label='linear line')
l2, = plt.plot(x, y1, color='red', linewidth=1.0, linestyle='--', label='square line')
#plt.legend(loc='upper right')

# 设置legend
plt.legend(handles = [l1, l2,], labels = ['a', 'b'], loc = 'best')
plt.show()

结果：

Paste_Image.png

Paste_Image.png