def read_conn_file(path: str) -> None:
    try:
        with open(path) as f:
            for line in f:
                if line[0] == '#':
                    # Ignore comments.
                    continue
                conn_line: str = line.rstrip()
                conn_line_splited: list = conn_line.split('\t')

                timestamp = float(conn_line_splited[0])
                conn_uid = conn_line_splited[1]
                src_ip = conn_line_splited[2]
                # ETC.
    except FileNotFoundError:
        print('Error: ')


path = 'PATH_TO_CONN_FILE'
read_conn_file(path)