splitting an xlsb file into several CSVs

xlsb_to_csv.py

import csv		
from pyxlsb import open_workbook

with open_workbook('PUB_Reg_Com_Rub_Sub_Act.xlsb') as wb:
	for sheetname in wb.sheets:
		print(sheetname)
		ofile  = open(sheetname.split('_')[0]+'.csv', "w")
		writer = csv.writer(ofile, delimiter=',', 
					quotechar='"', quoting=csv.QUOTE_ALL)
		with wb.get_sheet(sheetname) as sheet:
			for row in sheet.rows():
				csvline = ','.join(str(r.v) for r in row)
				writer.writerow(csvline)
		ofile.close()