Python：（使用matplotlib画图）在坐标图中进行注释：如添加箭头，添加文本等

先上个图 import matplotlib.pyplot as plt import numpy as np x = np.linspace(-5,5,100) y1 = 2 * x + 1 # y2 = x**2 plt.figure(num=3,figsize=(9,6)) # line_1 = plt.plot(x,y2,label='up') line_2 = plt.plot(x

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