importioimportgzipimportzlib# Write two chunks to the same compressed stream. In real usage# I send these chunks as two separate network messages, but in this# test I just save them to two local variables.data=io.BytesIO()gzip_file=gzip.GzipFile(fileobj=data,mode="wb")gzip_file.write(b"Hello World")gzip_file.flush()message1=data.getvalue()data.truncate(0)data.seek(0)gzip_file.write(b"Goodbye World")gzip_file.close()message2=data.getvalue()# Decode the two messages. Each one should decode separately,# but in Python 3.12b2 the compressor was not flushed with# Z_SYNC_FLUSH so the second message produces no output on its own# and both messages are emitted when the second message is added# to the decompressor's input.## This results in the error#   AssertionError: [b'', b'Hello WorldGoodbye World']decompressor=zlib.decompressobj(16+zlib.MAX_WBITS)messages= [decompressor.decompress(message1),decompressor.decompress(message2)]assertmessages== [b"Hello World",b"Goodbye World"],messages