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Pymunk is a easy-to-use pythonic 2d physics library

Project description


Pymunk is a easy-to-use pythonic 2d physics library that can be used whenever you need 2d rigid body physics from Python. It is built on top of the very capable 2d physics library Chipmunk.

2007 - 2016, Victor Blomqvist -, MIT License

This release is based on the latest Pymunk release (5.0.0), using Chipmunk 7.0 rev d7603e3927 (source included)

Getting the latest source:
 git clone


In the normal case pymunk can be installed with pip:

> pip install pymunk

It has one (or two) dependencies. CFFI and if not on Windows or OSX you also need a working gcc compiler.


Quick code example:

import pymunk               # Import pymunk..

space = pymunk.Space()      # Create a Space which contain the simulation
space.gravity = 0,-1000     # Set its gravity

body = pymunk.Body(1,1666)  # Create a Body with mass and moment
body.position = 50,100      # Set the position of the body

poly = pymunk.Poly.create_box(body) # Create a box shape and attach to body
space.add(body, poly)       # Add both body and shape to the simulation

while True:                 # Infinite loop simulation
    space.step(0.02)        # Step the simulation one step forward

For more detailed and advanced examples, take a look at the included demos (in examples/).


The source distribution of Pymunk ships with a number of demos in the examples directory, and it also contains the full documentaiton including API reference.

You can also find the full documentation including examples and API reference on the pymunk homepage,

Dependencies / Requirements

Basically Pymunk have been made to be as easy to install and distribute as possible, usually pip install will take care of everything for you.

  • Python (Runs on CPython 2.7 and 3.X. Pypy and Pypy3)
  • Chipmunk (Source included, and on Windows and OSX its already compiled)
  • CFFI (will be installed automatically by Pip)
  • Setuptools (should be included with Pip)
  • GCC and friends (optional, you need it to compile Chipmunk)
  • Pygame (optional, you need it to run the Pygame based demos)
  • Pyglet (optional, you need it to run the Pyglet based demos)
  • Matplotlib & Jupyter Notebook (optional, you need it to run the Matplotlib based demos)
  • Sphinx (optional, you need it to build documentation)


Pymunk is built on top of the c library Chipmunk. It uses CFFI to interface with the Chipmunk library file. Because of this Chipmunk has to be compiled before it can be used with Pymunk. Compilation has to be done with GCC or another compiler that uses the same flags.

The source distribution does not include a precompiled Chipmunk library file, instead you need to build it yourself.

There are basically two options, either building it automatically as part of installation using for example Pip:

> pip install

Or if you have the source unpacked / you got pymunk by cloning its git repo, you can explicitly tell pymunk to compile it inplace:

> python build_ext --inplace

Note that chipmunk is actually not built as a python extension, but distutils / setuptools doesnt currently handle pure native libraries that needs to be built in a good way if built with build_clib.

The compiled file goes into the /pymunk folder (same as, and others).

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