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        "author": "Mark Dickinson",
        "author_email": "dickinsm@gmail.com",
        "bugtrack_url": null,
        "classifiers": [
            "Development Status :: 4 - Beta",
            "Intended Audience :: Developers",
            "Intended Audience :: Education",
            "Intended Audience :: Science/Research",
            "License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)",
            "Operating System :: OS Independent",
            "Programming Language :: Python :: 2",
            "Programming Language :: Python :: 2.7",
            "Programming Language :: Python :: 3",
            "Programming Language :: Python :: 3.3",
            "Programming Language :: Python :: 3.4",
            "Programming Language :: Python :: 3.5",
            "Programming Language :: Python :: 3.6",
            "Programming Language :: Python :: Implementation :: CPython",
            "Topic :: Scientific/Engineering :: Mathematics"
        ],
        "description": "The ``bigfloat`` package is a Python package providing arbitrary-precision\r\ncorrectly-rounded binary floating-point arithmetic.  It is implemented as a\r\n`Cython <http://cython.org>`_ wrapper around the `GNU MPFR library\r\n<http://www.mpfr.org>`_.  A couple of lines of Python code should give the\r\nidea::\r\n\r\n    >>> from bigfloat import *\r\n    >>> with precision(200) + RoundTowardZero:\r\n    ...     print(sqrt(2))\r\n    ...\r\n    1.4142135623730950488016887242096980785696718753769480731766796\r\n    >>> with quadruple_precision:\r\n    ...     const_pi()\r\n    ...\r\n    BigFloat.exact('3.14159265358979323846264338327950280', precision=113)\r\n\r\nFeatures\r\n--------\r\n\r\n- Supports Python 2 (version 2.6 or later) and Python 3 (version 3.2 or later).\r\n\r\n- Exactly reproducible correctly-rounded results across platforms;\r\n  precisely-defined semantics compatible with the IEEE 754-2008 standard.\r\n\r\n- Support for mixed-type operations with Python integers and floats.\r\n\r\n- Support for emulating IEEE 754 arithmetic in any of the IEEE binary\r\n  interchange formats described in IEEE 754-2008.  Infinities, NaNs,\r\n  signed zeros, and subnormals are all supported.\r\n\r\n- Easy control of rounding modes and precisions via ``Context`` objects\r\n  and Python's ``with`` statement.\r\n\r\nDocumentation\r\n-------------\r\n\r\nFull `package documentation <http://bigfloat.readthedocs.org>`_ is hosted at\r\nRead the Docs.  Read on for a quick tour.\r\n\r\nA quick tour\r\n------------\r\n\r\nThe ``bigfloat`` package is small and simple to use.  Here's a quick\r\ntour of some of its features.\r\n\r\nFor demonstration purposes, start with::\r\n\r\n    >>> from bigfloat import *\r\n\r\nNote that this import shadows four builtin Python functions, namely\r\n``abs``, ``max``, ``min`` and ``pow``.  In normal usage you'll\r\nprobably only want to import the classes and functions that you\r\nactually need.\r\n\r\nThe main class is the ``BigFloat`` class::\r\n\r\n    >>> BigFloat(1)  # can be constructed from an integer, float or string\r\n    BigFloat.exact('1.0000000000000000', precision=53)\r\n    >>> BigFloat('3.14159') ** 2 / 6.0  # can combine with ints and floats\r\n    BigFloat.exact('1.6449312880166664', precision=53)\r\n    >>> BigFloat('0.1', precision(200)) # high-precision value from string\r\n    BigFloat.exact('0.1000000000000000000000000000000000000000000000000000\r\n    0000000002', precision=200)\r\n\r\nNewly-created ``BigFloat`` instances refer to the current *context* to\r\ndetermine what precision and rounding modes to use.  This current\r\ncontext is represented by a ``Context`` instance, and can be retrieved\r\nby calling ``getcontext``::\r\n\r\n    >>> getcontext()\r\n    Context(precision=53, emax=1073741823, emin=-1073741823,\r\n            subnormalize=False, rounding=ROUND_TIES_TO_EVEN)\r\n\r\nThe ``precision(200)`` argument passed to the ``BigFloat`` constructor\r\nabove is also an example of a ``Context``::\r\n\r\n    >>> precision(200)\r\n    Context(precision=200)\r\n\r\nThe context used for a calculation can be set using the ``setcontext``\r\nfunction, but a better way to make a temporary change to the context\r\nis to use Python's ``with`` statement::\r\n\r\n    >>> with precision(1000):\r\n    ...     print sqrt(2)\r\n    ...\r\n    1.41421356237309504880168872420969807856967187537694807317667973\r\n    7990732478462107038850387534327641572735013846230912297024924836\r\n    0558507372126441214970999358314132226659275055927557999505011527\r\n    8206057147010955997160597027453459686201472851741864088919860955\r\n    232923048430871432145083976260362799525140798964\r\n\r\nHere, ``sqrt`` is one of a number of mathematical functions that the\r\n``bigfloat`` package exports.  As you can see, these functions operate on\r\nintegers and floats as well as ``BigFloat`` instances, but always\r\nreturn a ``BigFloat`` instance.\r\n\r\nRounding modes can be controlled similarly.  Here are upper and lower\r\nbounds for \u03c0, accurate to 53 significant bits::\r\n\r\n    >>> with RoundTowardPositive:\r\n    ...     const_pi()\r\n    ...\r\n    BigFloat.exact('3.1415926535897936', precision=53)\r\n    >>> with RoundTowardNegative:\r\n    ...     const_pi()\r\n    ...\r\n    BigFloat.exact('3.1415926535897931', precision=53)\r\n\r\nAnd as you'd expect, ``with`` statements like those above can be\r\nnested.  ``Context`` objects can also be combined using addition::\r\n\r\n    >>> with RoundTowardPositive + precision(24):\r\n    ...     BigFloat(1) / 3\r\n    ...\r\n    BigFloat.exact('0.333333343', precision=24)\r\n\r\nVarious ``Context`` objects corresponding to IEEE 754 interchange\r\nformats are predefined::\r\n\r\n    >>> quadruple_precision\r\n    Context(precision=113, emax=16384, emin=-16493, subnormalize=True)\r\n    >>> half_precision\r\n    Context(precision=11, emax=16, emin=-23, subnormalize=True)\r\n    >>> with half_precision:\r\n            log(2)\r\n    ...\r\n    BigFloat.exact('0.69336', precision=11)\r\n\r\nInstallation\r\n------------\r\n\r\nThe ``bigfloat`` package is `available on the Python package index\r\n<https://pypi.python.org/pypi/bigfloat>`_, and can be installed in the usual\r\nway using ``easy_install`` or ``pip``.  Alternatively, the development sources\r\nmay be downloaded from the project's `homepage\r\n<https:/github.com/mdickinson/bigfloat>`_ on GitHub.\r\n\r\nFor more comprehensive installation instructions, please see the `full\r\ndocumentation <http://bigfloat.readthedocs.org/en/latest/#installation>`_.\r\n\r\nFeedback\r\n--------\r\n\r\nFeedback is welcome!  Please use the `GitHub issue tracker\r\n<https://github.com/mdickinson/bigfloat/issues>`_ to report issues.\r\nAlternatively, you can contact Mark Dickinson directly at dickinsm@gmail.com\r\nwith suggestions, complaints, bug reports, etc.\r\n\r\nLicense\r\n-------\r\n\r\nThe bigfloat package is copyright (C) 2009\u20132014 Mark Dickinson\r\n\r\nThe bigfloat package is free software: you can redistribute it and/or modify\r\nit under the terms of the GNU Lesser General Public License as published by\r\nthe Free Software Foundation, either version 3 of the License, or (at your\r\noption) any later version.\r\n\r\nThe bigfloat package is distributed in the hope that it will be useful, but\r\nWITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or\r\nFITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License\r\nfor more details.\r\n\r\nYou should have received a copy of the GNU Lesser General Public License\r\nalong with the bigfloat package.  If not, see <http://www.gnu.org/licenses/>.\r\n\r\nLinks\r\n-----\r\n- `Documentation at Read the Docs <http://bigfloat.readthedocs.org>`_\r\n- `Python package index <https://pypi.python.org/pypi/bigfloat>`_\r\n- `Project homepage at GitHub <https://github.com/mdickinson/bigfloat>`_\r\n- `Issue tracker <https://github.com/mdickinson/bigfloat/issues>`_",
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