将if语句与open workbook变量一起使用

workbook = open_workbook('example.xlsx')
if workbook is None:
    print("Failed to open workbook")
else:
    print("Workbook opened successfully")

workbook = open_workbook('example.xlsx')
if workbook is not None:
    sheet_names = workbook.sheet_names()
    if 'Sheet1' in sheet_names:
        print("Sheet1 exists in the workbook")
    else:
        print("Sheet1 does not exist in the workbook")

workbook = open_workbook('example.xlsx')
if workbook is not None:
    sheet = workbook.sheet_by_name('Sheet1')
    cell_value = sheet.cell_value(0, 0)
    if cell_value > 10:
        print("The value in cell A1 is greater than 10")
    else:
        print("The value in cell A1 is not greater than 10")