find_doi.py

    if update is False:
        # figure out next doi suffix to use if new
        department_dois = doi_assets.loc[doi_assets['department'] == metadata['department'].item()]
        if len(department_dois) != 0:
            # add 1 to highest suffix value and use zfill to pad w/zeros to 6 chars
            doi_suffix = str((department_dois['doi_suffix'].max()+1)).zfill(6)
        else:
            # new doi for dept, start at 000001
            doi_suffix = str(1).zfill(6)
        # zfill dept prefix to 3 chars
        doi = '10.26000/{}.{}'.format(str(dept_prefix.index[0]).zfill(3), doi_suffix)
    else:
        # find existing doi for update
        doi = doi_assets.loc[doi_assets['socrata_4x4'] == socrata_4x4]['doi'].item()