Python 使用 csv 模組讀寫 csv 檔案

目錄

一、讀取 csv 檔案

二、寫入 csv 檔案

# -*- coding: utf-8 -*-

import csv
import sys
def read_csv_file(filename):
with open(filename, 'r') as f:
csv_reader = csv.reader(f)
header_row = next(csv_reader)
print(header_row) # 輸出檔案頭
cnt = 0
for line in csv_reader: # 迴圈遍歷檔案的每一行資料
cnt += 1
print("line  : ,,,".format(line[0], line[1], line[2], line[3], cnt))
if "__main__" == __name__:
filename = sys.ar**[1]
read_csv_file(filename)

$ python read-csv-file.py file-list.csv 

['名稱', '大小', '路徑', '修改時間']
line [1] : security.evtx,391122944,c:\windows\system32\winevt\logs,2021-02-24 07:23:48
line [2] : mrt.exe,133326408,c:\windows\system32,2017-12-24 21:45:48
line [3] : mrt-kb890830.exe,133326408,c:\windows\system32,2017-12-24 21:45:50
line [4] : nvcplsetupint.exe,97078976,c:\windows\system32\driverstore\filerepository\nvdmwu.inf_amd64_26aa6356770b2e86,2016-09-12 21:15:30
line [5] : software,86245376,c:\windows\system32\config,2021-02-20 09:31:27
line [6] : software,86077440,c:\windows\system32\config\regback,2021-02-21 01:32:16
line [7] : srudb.dat,79495168,c:\windows\system32\sru,2021-02-24 21:20:00
line [8] : rcores64.dat,72520616,c:\windows\system32,2020-04-08 04:44:38
line [9] : rcores64.dat,72130584,c:\windows\system32\driverstore\filerepository\hdxsgma4.inf_amd64_67e758791d8608ce,2015-08-04 00:21:58
line [10] : bootckcl.etl,48234496,c:\windows\system32\wdi\logfiles,2021-02-20 09:33:51

# -*- coding: utf-8 -*-

import csv
import sys
def write_csv_file(filename):
with open(filename, 'w') as f:
csv_writer = csv.writer(f)
csv_writer.writerow(['type', 'name', 'age'])
for i in range(5):
csv_writer.writerow(['dog' + str(i), 'dog-' + str(i),  str(i)])
rows = list()
for i in range(6, 10):
csv_writer.writerows(rows)
if "__main__" == __name__:
filename = sys.ar**[1]
write_csv_file(filename)

$ python write-csv-file.py dogs.csv

$ cat dogs.csv 
type,name,age
dog0,dog-0,0
dog1,dog-1,1
dog2,dog-2,2
dog3,dog-3,3
dog4,dog-4,4
dog6,"xdog,-6",6
dog7,"xdog,-7",7
dog8,"xdog,-8",8
dog9,"xdog,-9",9

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