unable to read combo boxes in excel by xlrd package in python

[somesh g]

Hi..there

I want to read the combo box in excel by using "xlrd" but in the output it is showing empty message, its not reading the combo box can u guys help me how to read the combo box in excel by "xlrd"

code written like this

workbook = xlrd.open_workbook('path of the file')
worksheet = workbook.sheet_by_name('sheetname')
TargetSystem = worksheet.cell_value(4, 2)