human
Complete this python program:
def lock(remote=None):
assistant
#Here is the Python code you requested.

    """Place an update.lk
    ``remote`` can either be a dictionary containing repo configuration
    information, or a pattern. If the latter, then remotes for which the URL
    matches the pattern will be locked.
    """
    def _do_lock(repo):
        success = []
        failed = []
        if (not os.path.exists(repo['lockfile'])):
            try:
                with salt.utils.files.fopen(repo['lockfile'], 'w+') as fp_:
                    fp_.write('')
            except (IOError, OSError) as exc:
                msg = 'Unable    to    set    update    lock    for    {0}    ({1}):    {2}    '.format(repo['url'], repo['lockfile'], exc)
                log.debug(msg)
                failed.append(msg)
            else:
                msg = 'Set    lock    for    {0}'.format(repo['url'])
                log.debug(msg)
                success.append(msg)
        return (success, failed)
    if isinstance(remote, dict):
        return _do_lock(remote)
    locked = []
    errors = []
    for repo in init():
        if remote:
            try:
                if (not fnmatch.fnmatch(repo['url'], remote)):
                    continue
            except TypeError:
                if (not fnmatch.fnmatch(repo['url'], six.text_type(remote))):
                    continue
        (success, failed) = _do_lock(repo)
        locked.extend(success)
        errors.extend(failed)
    return (locked, errors)