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【Python】データサイズが大きいcsvファイルをgeneratorを使って読み込む

Last updated at Posted at 2020-02-12

import csv


def csv_reader(file, header=False):
    with open(file, "r") as f:
        reader = csv.reader(f)

        if header:
            next(reader)

        yield from reader


def main():
    g = csv_reader("xxx.csv", header=False)
    print(next(g)) # => 一行目

if __name__ == '__main__':
    main()




yield from reader


for row in reader:
    yield row

でも実装できます。

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