如何在matplotlib中添加標簽以進行繪圖

Question

這是圖表：

我需要為圖形線添加標簽。 藍線代表左，紅線代表右。 我怎么做？ 我使用了 set_ylabel 但在圖表左側添加了標簽，如圖所示。

    self.fig = Figure(figsize=(6, 4), dpi=96)
    self.ax =  self.fig.add_subplot(111)
    self.graph = FigureCanvasTkAgg(self.fig, master=self.win)
    self.canvas = self.graph.get_tk_widget()
    a = self.df["index"].unique()
    line, = self.ax.plot(a,self.df.loc[self.df.foot == "right","total_force"].values)
    self.ax.set_ylabel("right")
    line2, = self.ax.plot(a,self.df.loc[self.df.foot == "left","total_force"].values)
    self.clean_button()
    self.clean_flush()
    self.canvas.place(x= 150, y = 5)

Answer 1

使用這里描述的圖例： https : //matplotlib.org/3.2.1/api/_as_gen/matplotlib.pyplot.legend.html

Answer 2

調用plot()方法時必須指定更多內容：而不是

line, = self.ax.plot(a,self.df.loc[self.df.foot == "right","total_force"].values)

用

line, = self.ax.plot(a,self.df.loc[self.df.foot == "right","total_force"].values,
                     label = "right")

line2, = self.ax.plot(a,self.df.loc[self.df.foot == "left","total_force"].values
                      label = "left") 

然后使用以下方法顯示圖例：

self.ax.legend()