Python Chart: Setting Source Data and Series Titles using chart.set_source_data()

This line of code in Python sets the source data and series data titles for a chart. The chart.set_source_data() method is used to specify the range of data that will be used for the chart. \n\nThe range of data is specified using the sheet.range() method, which takes the cell range as a parameter. The cell range is constructed using the numtoexcelrow() function to convert column numbers to Excel column letters. \n\nIn this specific example, the source data range is defined as follows: \n- The first part of the range (numtoexcelrow(xingbie_start_col + data_col) + '2:' + numtoexcelrow(xingbie_start_col + data_col) + str(data_len + 2)) represents a range of cells in column xingbie_start_col + data_col, starting from row 2 and ending at row data_len + 2. \n- The second part of the range (numtoexcelrow(xingbie_start_col + x_col) + '2:' + numtoexcelrow(xingbie_start_col + x_col) + str(data_len + 2)) represents a range of cells in column xingbie_start_col + x_col, starting from row 2 and ending at row data_len + 2. \n\nThese two ranges are then passed as parameters to the chart.set_source_data() method to set the source data for the chart.