Ungzip stream on the fly in Python 2

ungzip_stream.py

import gzip, zlib

def ungzip_stream(fd):
    plain_fd = gzip.GzipFile(fileobj=fd, mode="r")
    # NOTE: this is what GzipFile does on new file start,
    #       we do that directly as GzipFile tries to seek() before it
    #       and fd could be unseekable().
    plain_fd._init_read()
    plain_fd._read_gzip_header()
    plain_fd.decompress = zlib.decompressobj(-zlib.MAX_WBITS)
    plain_fd._new_member = False
    return plain_fd

This doesn't always work, I wrote proper solution.