import numpy as np import matplotlib.pyplot as plt import matplotlib as mpl mpl.use('TkAgg') # 定义三个二维数组 xy1 = np.array([[40,0.0364],[50,0.0351],[60,0.0361],[70,0.0356],[80,0.0361]]) xy2 = np.array([[70,0.0356],[80,0.0361],[90,0.0356],[100,0.0358],[110,0.0359]]) xy3 = np.array([[100,0.0358],[110,0.0359],[120,0.0366],[130,0.0351]]) # 画出三条曲线 plt.plot(xy1[:,0], xy1[:,1], '-o', markersize=8, linewidth=2, label='curve 1') plt.plot(xy2[:,0], xy2[:,1], '-o', markersize=8, linewidth=2, label='curve 2') plt.plot(xy3[:,0], xy3[:,1], '-o', markersize=8, linewidth=2, label='curve 3') # 添加标签和图例 plt.xlabel('x') plt.ylabel('y') plt.legend() plt.show()，这个代码，我需要将三条曲线注明一下每条曲线代表啥，我该添加什么代码

您可以在画每条曲线的时候，通过label参数来为每条曲线添加名称，然后在图例中显示出来。修改后的代码如下所示：

import numpy as np 
import matplotlib.pyplot as plt 
import matplotlib as mpl  

mpl.use('TkAgg')  

# 定义三个二维数组 
xy1 = np.array([[40,0.0364],[50,0.0351],[60,0.0361],[70,0.0356],[80,0.0361]]) 
xy2 = np.array([[70,0.0356],[80,0.0361],[90,0.0356],[100,0.0358],[110,0.0359]]) 
xy3 = np.array([[100,0.0358],[110,0.0359],[120,0.0366],[130,0.0351]])  

# 画出三条曲线，添加标签
plt.plot(xy1[:,0], xy1[:,1], '-o', markersize=8, linewidth=2, label='curve 1') 
plt.plot(xy2[:,0], xy2[:,1], '-o', markersize=8, linewidth=2, label='curve 2') 
plt.plot(xy3[:,0], xy3[:,1], '-o', markersize=8, linewidth=2, label='curve 3')  

# 添加标签和图例 
plt.xlabel('x') 
plt.ylabel('y') 
plt.legend() 

plt.show()

您可以根据需要将label参数修改为对应的名称。