def ObsBandpass(obstring, graphtable=None, comptable=None, component_dict={}):
    """Generate a bandpass object from observation mode.

    If the bandpass consists of multiple throughput files
    (e.g., "acs,hrc,f555w"), then `ObsModeBandpass` is returned.
    Otherwise, if it consists of a single throughput file
    (e.g., "johnson,v"), then `~pysynphot.spectrum.TabularSpectralElement`
    is returned.

    See :ref:`pysynphot-obsmode-bandpass` and :ref:`pysynphot-appendixb`
    for more details.

    Parameters
    ----------
    obstring : str
        Observation mode.

    graphtable, comptable, component_dict
        See `~pysynphot.observationmode.ObservationMode`.

    Returns
    -------
    bp : `~pysynphot.spectrum.TabularSpectralElement` or `ObsModeBandpass`

    Examples
    --------
    >>> bp1 = S.ObsBandpass('acs,hrc,f555w')
    >>> bp2 = S.ObsBandpass('johnson,v')

    """
    ##Temporarily create an Obsmode to determine whether an
    ##ObsModeBandpass or a TabularSpectralElement will be returned.
    ob=ObservationMode(obstring,graphtable=graphtable,
                       comptable=comptable,component_dict=component_dict)
    if len(ob) > 1:
        return ObsModeBandpass(ob)
    else:
        return TabularSpectralElement(ob.components[0].throughput_name)
Generate a bandpass object from observation mode.

    If the bandpass consists of multiple throughput files
    (e.g., "acs,hrc,f555w"), then `ObsModeBandpass` is returned.
    Otherwise, if it consists of a single throughput file
    (e.g., "johnson,v"), then `~pysynphot.spectrum.TabularSpectralElement`
    is returned.

    See :ref:`pysynphot-obsmode-bandpass` and :ref:`pysynphot-appendixb`
    for more details.

    Parameters
    ----------
    obstring : str
        Observation mode.

    graphtable, comptable, component_dict
        See `~pysynphot.observationmode.ObservationMode`.

    Returns
    -------
    bp : `~pysynphot.spectrum.TabularSpectralElement` or `ObsModeBandpass`

    Examples
    --------
    >>> bp1 = S.ObsBandpass('acs,hrc,f555w')
    >>> bp2 = S.ObsBandpass('johnson,v')