def _write_log(*msg, end='\n'):
    """Write message to log output, ignoring the verbosity level.
    This is the most basic function.
    Parameters
    ----------
    *msg :
        One or more arguments to be formatted as string. Same behavior as print
        function.
    """
    from pypairs.settings import logfile
    if logfile == '':
        print(*msg, end=end)
    else:
        out = ''
        for s in msg:
            out += str(s) + ' '
        with open(logfile, 'a') as f:
            f.write(out + end)
