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Pythonでファイルに書き込まれたJSON文字列をパースする

Last updated at Posted at 2020-03-10

Pythonでファイルに書き込まれたJSON文字列をパースする方法を確認したのでメモ。

方法(json.load()

このようなファイルなら、

data.json
{
    "data":{
        "a": "こんにちは",
        "b": 123
    },
    "c": true
}

open()で取得したデータに対し**json.load()**を利用すればJSONパースできる。

import json

raw = open('data.json', 'r')
type(raw)
# <class '_io.TextIOWrapper'>

parsed = json.load(raw)
type(parsed)
# <class 'dict'>

parsed
# {'data': {'a': 'こんにちは', 'b': 123}, 'c': True}

print(json.dumps(parsed, ensure_ascii=False, indent=4))
#{
#    "data":{
#        "a": "こんにちは",
#        "b": 123
#    },
#    "c": true
#}

駄目な方法(json.loads

  • json.loadsは、TextIOWrapperタイプのデータはパースできない。
json.loads(raw)
# Traceback (most recent call last):
#   File "<stdin>", line 1, in <module>
#   File "/usr/lib64/python3.6/json/__init__.py", line 348, in loads
#     'not {!r}'.format(s.__class__.__name__))
# TypeError: the JSON object must be str, bytes or bytearray, not 'TextIOWrapper'

以上

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