openpyxl趋势线和R平方值

Question

我正在尝试将“线性”趋势线添加到我的Excel图表中，并使用openpyxl显示R平方值，但我找不到任何示例。

以下是生成图像所显示的图表的Python代码，没有趋势线和R平方公式chart image。

谢谢！

from openpyxl import Workbook, load_workbook 
from openpyxl.chart import (
    ScatterChart, 
    Reference, 
    Series, 
) 
from openpyxl.chart.trendline import Trendline 


wb = load_workbook(r"path to load blank workbook\data.xlsx") 
ws = wb.active 

rows = [ 
    ['Size', 'Batch 1'], 
    [3, 40], 
    [4, 50], 
    [2, 40], 
    [5, 30], 
    [6, 25], 
    [7, 20], 
] 

for row in rows: 
    ws.append(row) 

chart = ScatterChart() 
chart.title = "Scatter Chart" 
#chart.style = 13 
chart.x_axis.title = 'Size' 
chart.y_axis.title = 'Percentage' 



xvalues = Reference(ws, min_col=1, min_row=2, max_row=8) 
for i in range(2, 4): 
    values = Reference(ws, min_col=i, min_row=2, max_row=8) 
    series = Series(values, xvalues, title_from_data=True) 
    chart.series.append(series) 



line = chart.series[0] 
line.graphicalProperties.line.noFill = True 
line.marker.symbol = "circle" 


ws.add_chart(chart, "A10") 

wb.save("path to save workbook\scatter.xlsx") 

Answer 1

基本上不可能记录图表的所有可能性，因此您偶尔不得不深入到相关图表的XML中以了解它是如何完成的。也就是说，趋势线很容易做到。

from openpyxl.chart.trendline import Trendline 
line.trendline = Trendline()