Use $YUKICODER_TOKEN and $DROPBOX_TOKEN envvar for a security reason #917
      
        
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#672
導入時は上記のような経緯でコマンドライン引数として実装されていました。
https://github.com/online-judge-tools/api-client/blob/7936b6c56ae0b056bdb9f73fff7c0681160c71de/onlinejudge_api/main.py#L29
しかし、その後に api-client ではセキュリティ的に良くないとコマンドライン引数は廃止されています。
全廃すると影響が多大なので「使えるようにはしているけど推奨はしない」くらいの扱いにしておくのが良いのではないかと思います。