trying to read xlrd, extract data, and write csv

I am trying to read an excel file, extract some data, and write it out as a csv. This is pretty new to me and I'm messing up somewhere: I keep getting an empty csv. I'm sure I'm missing something very basic, but darned if I can see it. Here is the code: ``` import xlrd import os import csv from zipfile import ZipFile import datetimeI am trying to read an excel file, extract some