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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def guess_infer_extent(gtf_file):
 """ guess if we need to use the gene extent option when making a gffutils database by making a tiny database of 1000 lines from the original GTF and looking for all of the features """

    _, ext = os.path.splitext(gtf_file)
    tmp_out = tempfile.NamedTemporaryFile(suffix=".gtf", delete=False).name
    with open(tmp_out, "w") as out_handle:
        count = 0
        in_handle = utils.open_gzipsafe(gtf_file)
        for line in in_handle:
            if count > 1000:
                break
            out_handle.write(line)
            count += 1
        in_handle.close()
    db = gffutils.create_db(tmp_out, dbfn=":memory:", infer_gene_extent=False)
    os.remove(tmp_out)
    features = [x for x in db.featuretypes()]
    if "gene" in features and "transcript" in features:
        return False
    else:
        return True