FIELDS ={'rdf-schema#label': 'label',
         'URI': 'uri',
         'rdf-schema#comment': 'description',
         'synonym': 'synonym',
         'name': 'name',
         'family_label': 'family',
         'class_label': 'class',
         'phylum_label': 'phylum',
         'order_label': 'order',
         'kingdom_label': 'kingdom',
         'genus_label': 'genus'}


def process_file(filename, fields):

    process_fields = fields.keys()
    data = []
    with open(filename, "r") as f:
        reader = csv.DictReader(f)
        print process_fields
        for i in range(3):
            l = reader.next()

        for line in reader:
            for col in process_fields:
                fields[col].append(col)
                print line[col]


           # data.append(FIELDS)


File "/tmp/vmuser_hycrxztfsk/processing.py", line 70, in process_file
    fields[col].append(col)
AttributeError: 'str' object has no attribute 'append'