writes an instruction file that assumes wanting to read the values names in obsnames in order
    one per line from a model output file
    Args:
        obsnames: list of obsnames to read in
        insfilename: filename for INS file (default: model.output.ins)

    Returns:
        writes a file <insfilename> with each observation read off a line

def simple_ins_from_obs(obsnames, insfilename='model.output.ins'):
    """
    writes an instruction file that assumes wanting to read the values names in obsnames in order
    one per line from a model output file
    Args:
        obsnames: list of obsnames to read in
        insfilename: filename for INS file (default: model.output.ins)

    Returns:
        writes a file <insfilename> with each observation read off a line

    """
    with open(insfilename, 'w') as ofp:
        ofp.write('pif ~\n')
        [ofp.write('!{0}!\n'.format(cob)) for cob in obsnames]