1. # import xlrd #导入xlrd使用import
    2. # import xlrd as xl #导入xlrd并赋值给xl
    3. # from xlrd import open_workbook # 导入xlrd的open_workbook功能,为部分导入
    4. # from xlrd import open_workbook as owb # 导入xlrd的open_workbook功能,为部分导入,并赋值给owb