pyevmasm is an open-source assembler and disassembler library for the Ethereum Virtual Machine (EVM). It includes a command-line utility and a Python API. Developers can use this open-source project to assemble and disassemble code intended for an EVM.  The GitHub page includes detailed instructions on how to use the protocol, as well as additional documentation for clarified use.  The open-source project is updated and maintained by a group of 14 dedicated contributors.