https://github.com/ethereum/pyethereum https://github.com/ConsenSys/ethjsonrpc
https://qiita.com/marutake/items/15d5a31501caa6f07df9 https://qiita.com/kanehara/items/5f09401813b52a326ac5#コントラクトにアクセスする https://qiita.com/sapuri/items/5c9612e41ed7b57eca8e https://qiita.com/marutake/items/15d5a31501caa6f07df9