I have the following problem, when I want to save the graphic made taking the data of my excel I get it blank ...
wb = openpyxl.load_workbook(j)
sheet = wb.get_sheet_by_name('{}'.format(itemm))
data = Reference(sheet, min_col=2, min_row=2, max_col=4, max_row=tt+1)
print data
c2 = LineChart()
c2.height = 6.80
c2.width = 19
c2.title = "Subastadas"
c2.style = 12
c2.y_axis.title = "Cantidad"
c2.y_axis.crossAx = 500
c2.x_axis = DateAxis(crossAx=100)
c2.x_axis.title = "Date"
c2.add_data(data=data, titles_from_data=True)
sheet.add_chart(c2, "H1")
wb.save(j)