def num_channels(framefile):
return len(get_channel_names(framefile))<EOL>
Find the total number of channels in this framefile

    **Requires:** |LDAStools.frameCPP|_

    Parameters
    ----------
    framefile : `str`
        path to GWF-format file on disk

    Returns
    -------
    n : `int`
        the total number of channels found in the table of contents for this
        file