Python 读写 CSV 文件

typical usage

注意dictwriter需要提供fieldnames

with open("csvfile", "wt", newline="") as f:
    writer = csv.DictWriter(f, fieldnames=[], extrasaction="ignore")
    writer.writeheader()
    writer.writerow(d) # list of dict if writerows

with open("csvfile", "wt", newline="") as f:
    writer = csv.writer(f)
    writer.writerow(l) # list of list if writerows

with open("csvfile", "rt") as f:
    reader = csv.reader(f)
    for row in reader:
        print(row)

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