Skip to main content
Join the official Python Developers Survey 2018 and win valuable prizes: Start the survey!

Python module to modify bytecode

Project description

bytecode is a Python module to modify bytecode.

Install bytecode: pip install bytecode.

bytecode only works on Python 3.

Hello World

Example running print('Hello World!'):

from bytecode import Instr, Bytecode

bytecode = Bytecode()
bytecode.extend([Instr("LOAD_NAME", 'print'),
                 Instr("LOAD_CONST", 'Hello World!'),
                 Instr("CALL_FUNCTION", 1),
                 Instr("LOAD_CONST", None),
code = bytecode.to_code()


Hello World!


bytecode module version string: bytecode.__version__ (ex: '0.1').


  • Instr: abstract instruction, argument is not validated
  • ConcreteInstr: concrete instruction, argument must be an integer

Create instructions

  • Instr(name, arg=UNSET, *, lineno=None)
  • ConcreteInstr(name, arg=UNSET, *, lineno=None)
  • Instr.disassemble(code, offset)
  • ConcreteInstr.disassemble(code, offset)

Pseudo instructions

  • Label: target of jumps for Bytecode, must not be used in ConcreteBytecode
  • SetLineno: set the line number of following instructions


  • Bytecode: list of Instr
  • BytecodeBlocks: list of blocks, a block is a list of Instr and has a label
  • ConcreteBytecode: list of ConcreteInstr

Create bytecode

  • Bytecode.from_code(*, extended_arg_op=False)
  • BytecodeBlocks.from_code()
  • ConcreteBytecode.from_code()


  • bytecode.to_bytecode() -> Bytecode
  • bytecode.to_concrete_bytecode() -> ConcreteBytecode
  • bytecode.to_bytecode_blocks() -> BytecodeBlocks
  • bytecode.to_code() -> types.CodeType


  • 2016-02-26: Version 0.1
    • Rewrite completely the API!
  • 2016-02-23: Release 0.0
    • First public release

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Filename, size & hash SHA256 hash help File type Python version Upload date
bytecode-0.1-py3-none-any.whl (20.7 kB) Copy SHA256 hash SHA256 Wheel 3.4 Feb 26, 2016
bytecode-0.1.tar.gz (15.4 kB) Copy SHA256 hash SHA256 Source None Feb 26, 2016

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN SignalFx SignalFx Supporter DigiCert DigiCert EV certificate StatusPage StatusPage Status page