Python: Save excel workbook copy

save_workbook_copy.py

from xlrd import open_workbook
from xlutils.copy import copy

def save_workbook_copy(file_from, file_to):
    rb = open_workbook(file_from, formatting_info=True)
    wb = copy(rb)  # a writable copy (I can't read values out of this, only write to it)
    w_sheet = wb.get_sheet(0)  # the sheet to write to within the writable copy
    row_index = 0
    col_index = 0
    w_sheet.write(row_index, col_index,'DataToBeWritten')
    wb.save(file_to)