openblockchains/programming-blockchains: Programming Blockchains Step-by-Step book / guide. Let's build blockchains from scratch (zero) step by step. Let's start with crypto hashes...
Programming Cryptocurrencies and Blockchains in Ruby @ Yuki & Moto Press Bookshelf, Free (Online) Booklet
and in GoLang; many examples / solutions ...
and even one of Ethereum implementations is in GoLang
Blockchain in Python, by Max S. from Academind