handling BlockingIOError when writing a gzip stream in python 3 -


i want create gzip compressed stream via python 3 io libs. after compression want split stream in arbitrary sized chunks (later concatenated, cut not need respect compression blocks).

however not understand how handle blockingioerror , why bufferedwriter calls write after gzipfile writes header resulting in 10 byte call instead of full buffer_size buffer. 

#!/usr/local/bin/python3 import sys import io import gzip    class mybuf(io.rawiobase):      def write(self,b):         print("we got chunk of length %s" % len(b))      def writable(self):         return true  um = io.bufferedwriter(mybuf(), buffer_size=1024)   outf = gzip.gzipfile(fileobj=um, mode='w')  bw = io.textiowrapper(outf)  wrapped_stdin = io.bufferedreader(sys.stdin)  line in wrapped_stdin:     l = str.rstrip( line)     try:         bw.write(l)     except blockingioerror:         print("why happening?")  um.flush() #raises blockingioerror


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