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INSTALL.rst

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Prerequisites

This package requires Python 2.7 or 3.5 or later. The MPFR and GMP libraries will need to be already installed on your system, along with any necessary development headers for both of those libraries. On Linux, look for a package named something like libmpfr-dev or mpfr-devel, along with similarly named packages for GMP.

Installation from a release tarball

The instructions cover installation from either a repository clone, or a source distribution tarball. After cloning the repository or unpacking the tarball, you should have a top-level directory named something like bigfloat-0.4.0.

  1. Enter that top-level directory and execute the command:

    python setup.py install

    For a site-wide installation, you many need to be become superuser, or use the sudo command. You can also build and install in two separate steps:

    python setup.py build_ext
sudo python setup.py install

    For this to work, the MPFR and GMP libraries must already be installed on your system, complete with any necessary header files. If the libraries or include files are found in an unusual place, you many need to modify environment variables so that the setup command can find the necessary header files.

    An example: on OS X 10.9, using the system Python but with MPFR and GMP installed in /opt/local (e.g., by MacPorts), one can do:

    $ sudo LIBRARY_PATH=/opt/local/lib CPATH=/opt/local/include python setup.py install

    Alternatively, the include and library directories can be supplied to the build_ext command:

    $ python setup.py build_ext -I /opt/local/include -L/opt/local/lib
$ sudo python setup.py install

  2. (Optional) Test the installation by doing:

    $ python -m unittest discover bigfloat

  3. To check that everything's working, compute the square root of 2 to 1000 bits of precision:

    >>> from bigfloat import precision, sqrt
>>> with precision(200):
...     print(sqrt(2))
...
1.4142135623730950488016887242096980785696718753769480731766796

If installation was successful, the bigfloat-0.4.0 directory that you created can now be deleted.