python csv:将结果保存到csv文件 [英] python csv: save results to csv file
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问题描述
import csv
with open('test.csv', 'rb') as f:
data = list(csv.reader(f))
import collections
counter = collections.defaultdict(int)
for row in data:
counter[row[1]] += 1
for row in data:
if counter[row[1]] >= 4:
writer = csv.writer(open("test1.csv", "wb"))
writer.writerows(row)
我得到奇怪的输出!
使用 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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