import io
import gzip
# this raises IOError because `buf` is incomplete. It may work if you supply the complete buf
buf = b'\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\x03\xed:\xf9w\xdaH\xd2?\xcf\xbc'
with gzip.GzipFile(fileobj=io.BytesIO(buf)) as f:
content = f.read()
print(content.decode('utf-16'))