用途
csv.writer：
import csvwith open('thefile.csv', 'rb') as f: data = list(csv.reader(f))import collectionscounter = collections.defaultdict(int)for row in data: counter[row[0]] += 1writer = csv.writer(open("/path/to/my/csv/file", 'w'))for row in data: if counter[row[0]] >= 4: writer.writerow(row)
