Python open the excel with win32com, open the specific file demo. XLSX file, select one of the sheet, how do we determine the boundary of this data in sheet form? Such as a data column is the largest H30, data is the biggest line B50, just think that forms the boundary is H50, as long as we traverse the A1 to H50, you can access all the data! Ask how to determine the boundary of this data in sheet form?