sh = wb.sheet_by_name('Sheet1')
your_csv_file = open('your_csv_file.csv', 'wb')
wr = csv.writer(your_csv_file, quoting=csv.QUOTE_ALL)
for rownum in range(sh.nrows):
    wr.writerow(sh.row_values(rownum))
your_csv_file.close()
Convert XLSX to CSV correctly using python