python3 の tempfile + write はデフォルトのままだと <object>.write(<a bytes-like object>) が求められる - Qiita

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そもそもmodeとencodingを指定してテキストモードで一時ファイルをひらけばいい話 https://docs.python.jp/3/library/tempfile.html#tempfile.NamedTemporaryFile