Photo csv parser

parse_photos.py

import csv
import gzip
from contextlib import closing

def photo_tup_generator(in_filename, bb_left, bb_right, bb_bottom, bb_top):
    """                                                                                                                                                                                     
    Note: rows yielded are in utf8 (have not been decoded to unicode)                                                                                                                                                             
    """
    with closing(gzip.open(in_filename, mode="rb", compresslevel=6)) as f:
        reader = csv.reader(f, escapechar='\\', doublequote=True, quotechar='"', quoting=csv.QUOTE_MINIMAL)
        for row in reader:
            if (len(row) == 12) and (row[1][-4] == "@"):
                photo_id, owner_id, datetaken, datetaken_granularity, date_upload, lat, lon, accuracy, tags, title, desc, views = row
                if lat and lon:
                    lat = float(lat)
                    lon = float(lon)
                    if lat > bb_bottom and lat <= bb_top:
                        if lon> bb_left and lon < bb_right:
                            yield row