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PythonでCSVの読み書き

Last updated at Posted at 2022-04-14

listをcsvに書き込み,読み込みまたlistに戻す方法です.

import pandas as pd

pandasを使います.(他にも方法はありますが私の好みです)
初期装備ではないのでインストールが必要です.

CSVの書き込み

書き込みたいlistなどの変数をDataFrameに変換して保存できます.

df = pd.DataFrame(sample_lists)
df.to_csv('sample_lists.csv')

CSVの読み出し

df = pd.read_csv('sample_lists.csv', index_col=0)
sample_lists = df.values.tolist()

index_colをつけないと,自動でつけてくれた0.1.2.,,,のインデックスも一緒についてきてしまい邪魔です.

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