我有两个CSV文件，一个名为web_file，有25,000行，另一个名为inv_file，有320,000行.
我需要从web_file的第1列读取每一行，并从inv_file的第1列的每一行找到所有匹配值，然后将inv_file的行写到一个新的CSV文件中.
使用只有5-10行的示例文件也不能说明这个问题，所以我列出了一些随机数字，例如下面.
示例Web_FILE:
Inv_SKU,Web_SKU,Brand,Barcode
225481-34,225481-34,brand1,987654321
0486592,0486592,brand2,654871233
AB56412,AB56412,brand2,651273214
LL-123456,LL-123456,brand3,748912349
JLPD-65,JLPD-65,brand6,341541648
20143966,20143966,brand3,82193714
39585824,39585824,brand5,36837329
78066099,78066099,brand4,98398987
44381051,44381051,brand1,9090428
86529443,86529443,brand4,6861670
DF 5645 12,DF 5645 12,brand1,489456138
9845671325,9845671325,brand4,498451315
59634923,59634923,brand4,35828574
85290760,85290760,brand2,64562216
41217184,41217184,brand4,12816236
AE48915,AE48915,brand1,342536125
93981723,93981723,brand2,58155601
示例inv_file:
Inv_SKU,Web_SKU,Brand,Barcode
0486592,0486592,brand2,654871233
LL-123456,LL-123456,brand3,748912349
9845671325,9845671325,brand4,498451315
OI3248967,OI3248967,brand2,891513211
AB56412,AB56412,brand2,651273214
DF 5645 12,DF 5645 12,brand1,489456138
225481-34,225481-34,brand1,987654321
123456789,123456789,brand5,654986413
9841531,9841531,brand3,543254512
AE48915,AE48915,brand1,342536125
JLPD-65,JLPD-65,brand6,341541648
MMMM,MMMM,brand7,384941542
23481-4323,23481-4323,brand3,489123157
98451321,98451321,brand4,498121354
23454152,23454152,brand2,894165123
10275690,10275690,brand2,25612670
20143966,20143966,brand3,82193714
59634923,59634923,brand4,35828574
65800253,65800253,brand5,72318134
67722613,67722613,brand6,93290033
92617199,92617199,brand7,95078073
15379652,15379652,brand1,56281224
85290760,85290760,brand2,64562216
78066099,78066099,brand4,98398987
41217184,41217184,brand4,12816236
87152990,87152990,brand4,95058925
73813369,73813369,brand1,2395994
50201544,50201544,brand1,9167830
93981723,93981723,brand2,58155601
39585824,39585824,brand5,36837329
29082963,29082963,brand3,23393947
23856043,23856043,brand8,57295562
74249006,74249006,brand8,83219065
94376071,94376071,brand8,94887004
14553763,14553763,brand8,14223230
44381051,44381051,brand1,9090428
7598085,7598085,brand1,48967969
56383025,56383025,brand2,68864452
44338055,44338055,brand4,47043853
86529443,86529443,brand4,6861670
我try 使用这段代码，但最后得到了许多重复的行，我希望避免重复行，因为我实际使用的文件太大了，以至于最终有数百万行.
with open('inv_file.csv', 'r') as f1, open('web_file.csv', 'r') as f2:
inv_file = f1.readlines()
web_file = f2.readlines()
with open('result.csv', 'r+') as f3:
result_file = f3.readlines()
while len(result_file) < len(web_file):
for row in inv_file:
for row1 in web_file:
if row[0] in row1[0]:
f3.write(row1)
break