NumPy aware dynamic Python compiler using LLVM
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A compiler for Python array and numerical functions

Numba is an Open Source NumPy-aware optimizing compiler for Python
sponsored by Continuum Analytics, Inc.  It uses the
remarkable LLVM compiler infrastructure to compile Python syntax to
machine code.

It is aware of NumPy arrays as typed memory regions and so can speed-up
code using NumPy arrays.  Other, less well-typed code will be translated
to Python C-API calls effectively removing the "interpreter" but not removing
the dynamic indirection.

Numba is also not a tracing JIT.  It *compiles* your code before it gets
run either using run-time type information or type information you provide
in the decorator.

Numba is a mechanism for producing machine code from Python syntax and typed
data structures such as those that exist in NumPy.


* llvmlite
* numpy (version 1.7 or higher)
* funcsigs (for Python 2)


The easiest way to install numba and get updates is by using the Anaconda


   $ conda install numba

If you wanted to compile Numba from source,
it is recommended to use conda environment to maintain multiple isolated
development environments.  To create a new environment for Numba development::

   $ conda create -p ~/dev/mynumba python numpy llvmlite

To select the installed version, append "=VERSION" to the package name,
where, "VERSION" is the version number.  For example::

   $ conda create -p ~/dev/mynumba python=2.7 numpy=1.9 llvmlite

to use Python 2.7 and Numpy 1.9.

If you need CUDA support, you should also install the CUDA toolkit::

   $ conda install cudatoolkit

This installs the CUDA Toolkit version 7.5, which requires driver version 352.79
or later to be installed.

Custom Python Environments

If you're not using conda, you will need to build llvmlite yourself:

Building and installing llvmlite

See for the most up-to-date instructions.
You will need a build of LLVM 3.7.


   $ git clone
   $ cd llvmlite
   $ python install

Installing Numba


   $ git clone
   $ cd numba
   $ pip install -r requirements.txt
   $ python build_ext --inplace
   $ python install

or simply


   $ pip install numba

If you want to enable CUDA support, you will need to install CUDA Toolkit 7.5.
After installing the toolkit, you might have to specify environment variables
in order to override the standard search paths:

  Path to the CUDA driver shared library
  Path to the CUDA libNVVM shared library file
  Path to the CUDA libNVVM libdevice directory which contains .bc files


Mailing Lists

Join the numba mailing list

or access it through the Gmane mirror:

Some old archives are at:


See if our sponsor can help you (which can help this project):

Continuous Integration