def get_other_keys(operator):
    """
    function to return a bunch of keys for opening metafiles and the like for a specified operator
    :param operator: valid operators string: one on 'COSMOS-UK' and 'COSMOS-US'
    :return: dictionary of key strings
    """

    ret_dict = {}
    if "COSMOS-US" == operator:
        ret_dict['meta_sep'] = '\t'
        ret_dict['name_column'] = 'SiteName'
        ret_dict['length_mod'] = 0
        ret_dict['extension'] = '.txt'

    elif "COSMOS-UK" == operator:
        ret_dict['meta_sep'] = ','
        ret_dict['name_column'] = 'SITE_ID'
        ret_dict['length_mod'] = 1
        ret_dict['extension'] = '.csv'

    return ret_dict