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Pythonでjsonlを読み書きする

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jsonlとは

改行区切りの1レコードがjsonになっているデータのことです。
こんなデータ↓

{"name": "Gilbert", "wins": [["straight", "7♣"], ["one pair", "10♥"]]}
{"name": "Alexa", "wins": [["two pair", "4♠"], ["two pair", "9♠"]]}
{"name": "May", "wins": []}
{"name": "Deloise", "wins": [["three of a kind", "5♣"]]}

pandas使わない方法

ファイル読み込み

import json
with open('hoge.jsonl') as f:
    jsonl_data = [json.loads(l) for l in f.readlines()]

ファイル出力

with open('fuga.jsonl', 'w') as f:
    f.writelines([json.dumps(l) for l in jsonl_data])

pandas使う方法

ファイル読み込み

import pandas as pd
df = pd.read_json('piyo.jsonl', orient='records', lines=True)

ファイル出力

df.to_json('piyopiyo.jsonl', orient='records', force_ascii=False, lines=True)

感想

  • 備忘録です。
  • pandasで読んだり、readlines()で読んだりしてるなぁと思ったので書いておきました。
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