转载：https://blog.csdn.net/daixiangzi/article/details/74357452
plt.legend(loc='位置'),
参数列表：
(self,parent, handles, labels, loc=None, numpoints=None, markerscale=None, markerfirst=True, scatterpoints=None, scatteryoffsets=None, prop=None, fontsize=None, borderpad=None, labelspacing=None, handlelength=None, handleheight=None, handletextpad=None, borderaxespad=None, columnspacing=None, ncol=1, mode=None, fancybox=None, shadow=None, title=None, framealpha=None, edgecolor=None, facecolor=None, bbox_to_anchor=None, bbox_transform=None, frameon=None, handler_map=None)
loc:图例位置
edgecolor：图例外框颜色
facecolor：图例框内填充颜色
title：图例标题
位置可选参数：例如 plt.legend（loc='upper left'）图例在左上角
'best' : 0
| 'upper right'
| 'upper left' : 2,
| 'lower left' : 3,
| 'lower right' : 4,
| 'right' : 5,
| 'center left' : 6,
| 'center right' : 7,
| 'lower center' : 8,
| 'upper center' : 9,
| 'center' : 10,
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