python-excel/xlwt — pull request #50 by petschki (2014-06-12 14:56:31+00:00)
Title: Update Excel limits

according to Excel limits in http://office.microsoft.com/en-us/excel-help/excel-specifications-and-limits-HP010342495.aspx the Worksheet size is 1,048,576 rows by 16,384 columns since Excel 2010