except ValidationError as v:
        if row['end_date'] == 'null' or 'None' or '':
            row['end_date'] = None

except ValidationError as v:
        if row['end_date'] in ['null', 'None', '']:
            row['end_date'] = None

end_date=None

if row[value] == 'None':
            row[value] = None

if row[value] == 'None':
            row[value].replace(row[value], None)