Py之matplotlib.pyplot：matplotlib.pyplot的plt.legend函数的简介、使用方法之详细攻略
Py之matplotlib.pyplot：matplotlib.pyplot的plt.legend函数的简介、使用方法之详细攻略matplotlib.pyplot的plt.legend函数的简介legend模块定义了legend类，负责绘制与轴和/或图形相关的图例。Legend类是一个图例句柄和图例文本的容器，该函数是用来给当前图像添加图例内容。大多数用户通常会通过图例函数创建图例。图例处理程序映射指定如何在轴或图形中从artists(线、补丁等)创建图例句柄。默认的图例处理程序定义在legend_handler模块中。虽然默认的图例处理程序并没有覆盖所有的artists类型，但是可以定义自定义图例处理程序来支持任意对象。plt.legend(loc='best',frameon=False) #frameon参数，去掉图例边框plt.legend(loc='best',edgecolor='blue') #edgecolor参数，设置图例边框颜色plt.legend(loc='best',facecolor='blue') #facecolor参数，设置图例背景颜色,若无边框,参数无效plt.legend(["CH", "US"], title='China VS Us') #设置图例标题plt.legend([p1, p2], ["CH", "US"]) #设置图例名字及对应关系原始文档：https://matplotlib.org/api/legend_api.html?highlight=legend#module-matplotlib.legend1、参数解释参数解释具体应用locLocation code string, or tuple (see below).图例所有figure位置plt.legend(loc='upper center')0: 'best'1: 'upper right'2: 'upper left'3: 'lower left'4: 'lower right'5: 'right'6: 'center left'7: 'center right'8: 'lower center'9: 'upper center'10: 'center'propthe font property字体参数fontsizethe font size (used only if prop is not specified)fontsize : int or float or {'xx-small’, 'x-small’, 'small’, 'medium’, 'large’, 'x-large’, 'xx-large’}markerscalethe relative size of legend markers vs. original图例标记与原始标记的相对大小markerfirstIf True (default), marker is to left of the label.如果为True，则图例标记位于图例标签的左侧numpointsthe number of points in the legend for line为线条图图例条目创建的标记点数scatterpointsthe number of points in the legend for scatter plot为散点图图例条目创建的标记点数scatteryoffsetsa list of yoffsets for scatter symbols in legend为散点图图例条目创建的标记的垂直偏移量frameonIf True, draw the legend on a patch (frame).控制是否应在图例周围绘制框架fancyboxIf True, draw the frame with a round fancybox.控制是否应在构成图例背景的FancyBboxPatch周围启用圆边shadowIf True, draw a shadow behind legend.控制是否在图例后面画一个阴framealphaTransparency of the frame.控制图例框架的 Alpha 透明度edgecolorFrame edgecolor.facecolorFrame facecolor.ncolnumber of columns 设置图例分为n列展示borderpadthe fractional whitespace inside the legend border图例边框的内边距labelspacingthe vertical space between the legend entries图例条目之间的垂直间距handlelengththe length of the legend handles图例句柄的长度handleheightthe height of the legend handles图例句柄的高度handletextpadthe pad between the legend handle and text图例句柄和文本之间的间距borderaxespadthe pad between the axes and legend border轴与图例边框之间的距离columnspacingthe spacing between columns 列间距titlethe legend titlebbox_to_anchorthe bbox that the legend will be anchored.指定图例在轴的位置bbox_transformthe transform for the bbox. transAxes if None.2、源代码更新……def legend Found at: matplotlib.pyplot@_copy_docstring_and_deprecators(Axes.legend)def legend(*args, **kwargs): return gca().legend(*args, **kwargs)# Autogenerated by boilerplate.py. Do not edit as changes will be lost.matplotlib.pyplot的plt.legend函数的使用方法1、基础用法plt.figure() col_cou_len=len(Keys) plt.pie(x=Values,labels=Keys,colors=cols[:col_cou_len], startangle=90,shadow=True,autopct='%1.3f%%') plt.title(tit_name) plt.legend() plt.show()