tmpfile and gzip combination problem

'wrb' is not a valid mode.

This works fine:

import tempfile
import gzip

with tempfile.TemporaryFile(mode='w+b') as f:
    f.write(data.decode('base64'))
    f.flush()
    f.seek(0)
    gzf = gzip.GzipFile(mode='rb', fileobj=f)
    print gzf.read()