How to calculate ckb block hash？

shooter · June 4, 2019, 7:23pm

nervosnetwork/ckb/blob/3c4bd8fd07fd207e3be370dbbf91ed57d395433b/test/src/node.rs#L258-L264


let header_builder = HeaderBuilder::default()
    .version(version.0)
    .number(number.0)
    .difficulty(difficulty)
    .timestamp(current_time.0)
    .parent_hash(parent_hash)
    .seal(Seal::new(rand::random(), Bytes::default()));

the rust code so hard， can you provides ruby/python code?