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