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kivy JsonStore でUnicodeDecodeError を解決する

Last updated at Posted at 2020-09-23

問題のエラー

Kivyでstorageモジュールを使ってjsonを扱う際、以下のようなエラーに遭遇した。
※環境はpython3.8 ですが、大した差異はないと思います。

   File "C:\programing\project\hoge\main.py", line 33, in _init_load
     self.store = JsonStore('test.json', )
   File "C:\Users\user\AppData\Local\Programs\Python\Python38\lib\site-packages\kivy\storage\jsonstore.py", line 29, in __init__
     super(JsonStore, self).__init__(**kwargs)
   File "C:\Users\user\AppData\Local\Programs\Python\Python38\lib\site-packages\kivy\storage\__init__.py", line 134, in __init__
     self.store_load()
   File "C:\Users\user\AppData\Local\Programs\Python\Python38\lib\site-packages\kivy\storage\jsonstore.py", line 43, in store_load
     data = fd.read()
 UnicodeDecodeError: 'cp932' codec can't decode byte 0x82 in position 85: illegal multibyte sequence

親の顔より見たUnicodeDecodeErrorですね。日本語が入ってることが原因ですかね?
このエラーは基本的にopen関数の引数にencoding='utf-8'を追加すれば解決できます。
というわけでstorageモジュールの中でjsonファイルを開く部分をサクッと変更します。
31行目に読み込みを行う関数があるので、そこのopen部分にキーワード引数を追加します。

kivy/storage/jsonstore.py
def store_load(self):
        if not exists(self.filename):
            folder = abspath(dirname(self.filename))
            if not exists(folder):
                not_found = IOError(
                    "The folder '{}' doesn't exist!"
                    "".format(folder)
                )
                not_found.errno = errno.ENOENT
                raise not_found
            return
        with open(self.filename, encoding='utf-8') as fd:    # ココ
            data = fd.read()
            if len(data) == 0:
                return
            self._data = loads(data)

結果

正常に読み込むことに成功しました。
日本語はややこしいですね。。。

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