There is no push_action to Eosio account objects

[cppfuns]

For the eosio object type, you also need the push_action method, because you need to initialize the system contract. Currently have to use cleos directly

cleos.PushAction(
    eosio,
    "init",
    '[0, "4,EOS"]',
    (eosio, Permission.ACTIVE))

[stefanzarembinski]

You are right. Will be fixed soon.