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pip installで UnicodeDecodeErrorが出たときの対処方法(python3.7以降)

backtesting.pyをpipでインストールしようとしたところ、下記のような UnicodeDecodeErrorが出てハマったので

python -m pip install backtesting
UnicodeDecodeError: 'cp932' codec can't decode byte 0x94 in position 4437: illegal multibyte sequence
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.



なお、PYTHONUTF8と同じ機能は、過去バージョンにおいてはpython -X utf8 xxxx.pyでも実現できているのですが、python -X utf8 -m pip install ~はうまくいきませんでした。

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Help us understand the problem. What are the problem?