#!/usr/bin/pythonbath_in = open("gebco_bathy.21601x10801.bin","r")bath_out = open("gebco_bathy.21601x10801x8.bin","w")import array,time,ost = time.time()while 1: data = bath_in.read(10240) if not data: break a = array.array("H") a.fromstring(data) l = array.array("c") for d in a: nd = chr(d>>8) l.append(nd) bath_out.write(l.tostring()) bath_out.flush() nt = time.time() if t + 1 < nt: t = nt print len(data), len(data), len(l.tostring()), float(bath_in.tell()) / float(os.fstat(bath_in.fileno())[6])