經常會用到在一張圖上放多條線進行對比分析的情況，具體代碼如下：
plt.rcParams['font.sans-serif']=['SimHei'] # 用來正常顯示中文標簽 plt.rcParams['axes.unicode_minus']=False # 用來正常顯示負號 # 畫出雙坐標軸圖像 fig,ax1 = plt.subplots(figsize = (10,8)) ax2 = ax1.twinx() l1, = ax1.plot(data['date'],data["s_dq_pctchange"],'r-') l2, = ax2.plot(data['date'],data["s_dq_volume"],'g-') # 設置x,y軸文字說明 ax1.set_xlabel('time') ax1.set_xticklabels(data["date"], rotation=45) ax1.set_ylabel("y1,s_dq_pctchange") ax2.set_ylabel("y2,s_dq_volume") # 設置圖例 plt.legend(handles=[l1,l2,],labels=['s_dq_pctchange','s_dq_volume'],loc='best') # 設置標題 ax1.set_title('Comparison chart') ''' # 兩條line的數據 line1 = [(2, 0), (2, 1)] line2 = [(7, 0), (7, 1)] (line1_xs, line1_ys) = zip(*line1) (line2_xs, line2_ys) = zip(*line2) # 創建兩條線，並添加 ax1.add_line(Line2D(line1_xs, line1_ys, linewidth=1, color='black')) ax1.add_line(Line2D(line2_xs, line2_ys, linewidth=1, color='black')) ''' plt.show()
