您可以手动调整顺序,方法是使用ax.get_legend_handles_labels 获取图例句柄和标签,然后对结果列表重新排序,并将它们提供给ax.legend。像这样:
import matplotlib.pyplot as plt
import numpy as np
fig,ax = plt.subplots(1)
ax.plot(np.arange(5),np.arange(5),'bo-',label='plot1')
ax.errorbar(np.arange(5),np.arange(1,6),yerr=1,marker='s',color='g',label='errorbar')
ax.plot(np.arange(5),np.arange(2,7),'ro-',label='plot2')
handles,labels = ax.get_legend_handles_labels()
handles = [handles[0], handles[2], handles[1]]
labels = [labels[0], labels[2], labels[1]]
ax.legend(handles,labels,loc=2)
plt.show()