def is_gzip_file(abspath):
    """Parse file extension.

    - *.json: uncompressed, utf-8 encode json file
    - *.gz: compressed, utf-8 encode json file
    """
    abspath = abspath.lower()
    _, ext = os.path.splitext(abspath)
    if ext in [".gz", ".zip"]:
        is_gzip = True
    else:
        is_gzip = False
    return is_gzip