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What's new in bigfloat 0.4.0?

Release date: 2019-12-30

This minor release adds a number of small features, changes the default context to match IEEE 754 quadruple precision (binary128), and fixes support for recent Python versions.

Thanks to Hugo van Kemenade for contributions to this release.

New Features

  • Wrap mpfr_buildopt_gmpinternals_p and mpfr_buildopt_tune_case. (#54)
  • Add bigfloat.__version__ (#46).
  • Add bigfloat.notequal. (#47)
  • Add format support. (#58).
  • Add support for round, math.floor, math.ceil, math.trunc on Python 3. (#64)
  • Add support for divmod and the // operator. (#69)
  • New floordiv and mod functions. The new mod replaces the old mod function, which has been renamed to fmod. (#69)

Changes

  • The default context now matches IEEE 754 quadruple precision instead of double precision. (#72, #89, #87)
  • Infinities and NaNs are now represented as 'inf' and 'nan' rather than 'Infinity' and 'NaN', for consistency with the float type, and for consistency with the newly-introduced string formatting.
  • The 'mod' function now follows Python sign conventions; the old 'mod' function has been renamed to 'fmod'. The '%' operator now also follows Python sign conventions. (#69)
  • MPFR version 3.0.0 or later is required.
  • Support for Python versions earlier than 3.5 or 2.7 has been dropped. Support for Python 3.7 and 3.8 has been added. (#75, 81).

Bugfixes

  • The root function was accidentally wrapping cbrt (#60). Now fixed (#62).
  • Fix a test failure with Mpfr 4.0, that was due a change in the value of MPFR_PREC_MIN. (#77)
  • Fix initialization of the context on background threads. (#91)
  • Fix unit tests that changed the context and didn't reset their changes. (#92, #98)

Build

  • Use language_level=3 in the Cython code. (#96)

Documentation

  • Installation documentation cleaned up. (#68)
  • Add cmp to list of shadowed builtins in README.rst. (#63)
  • Fix (outdated) uses of strings for rounding modes. (#57)

What's new in bigfloat 0.3.0?

Library

  • Fix string-returning functions and string constants in mpfr module to return something of type str both on Python 2 and Python 3. In earlier 0.3.0 pre-releases, objects of type unicode were being returned on Python 2.
  • Declarations in cmpfr.pxd fixed to include const where necessary; this fixes some compiler warnings.
  • Improved tests for hashing.

Miscellaneous

  • Fix documentation link for PyPI upload.
  • Docs updated to remove outdated instructions about use under Python 2.5 and outdated information (dating from the earlier ctypes version) about runtime location of the MPFR and GMP libraries.
  • README, setup.py updates: include the quick tour in the README, make content match that of the setup.py long description.
  • CHANGELOG, README, INSTALL files updated with various reStructuredText fixes; renamed to add .rst suffix so that they display nicely on GitHub.
  • Update copyright notices.

What's new in bigfloat 0.3.0b1?

Library

  • Python 3.2 and later are now supported. Python 2 support requires Python 2.6 or later.
  • Added support for the new 'divide-by-zero' flag (exposed as ZeroDivision to bigfloat).

Miscellaneous

What's new in bigfloat 0.3.0a2?

  • Minor documentation fixes.

What's new in bigfloat 0.3.0a1?

Prerequisites

  • For now, Python 2.7 and MPFR version >= 3.0 are required. Support for earlier versions of Python is planned. Support for MPFR 2.x will probably not be added.

Library

  • Major rewrite and restructuring of the core code. The core now uses Cython rather than ctypes.
  • mpfr module now separately available as an extension type, with semantics very close to the Mpfr library.
  • Added bigfloat support for new rounding mode MPFR_RNDA (round away from zero).
  • Rounding modes are now represented as named integers (instances of RoundingMode, an int subclass), rather than strings. This allows them to be passed directly to Mpfr functions.
  • Fixed a bug that meant old context wasn't restored when changing exponents with one valid exponent and one invalid. (eminmax)
  • Many more docstrings than originally; better function signatures.
  • Restructured bigfloat package: mpfr wrapper module is now bigfloat.mpfr, context class and related functions are in bigfloat.context, rounding modes are defined in bigfloat.rounding_modes, and the main BigFloat type is defined in bigfloat.core. Everything is importable directory from bigfloat, as before.

Documentation

  • Most of the documentation is now generated automatically using Sphinx's autodoc extension.

What's new in bigfloat 0.2.1?

Library

  • Simplify weakref callback scheme used to ensure BigFloat instances are freed properly.
  • Make sure all python files in distribution have the LGPL header.

What's new in bigfloat 0.2?

Library

  • The setup.py file no longer attempts to locate the MPFR library at install time. The configuration file still exists, and can be edited to give a hard-coded location. Alternatively, ctypes should find the library if it's within the usual library search paths. (If not, it might be necessary to set LD_LIBRARY_PATH or DYLD_LIBRARY_PATH.)
  • Use a weakref callback to ensure mpfr_clear gets called, instead of relying on __del__.
  • Make bigfloat compatible with versions of MPFR as far back as MPFR 2.3.0
  • Relicense under LGPL, since this package might be considered a derived work of MPFR.

Tests

  • Skip the hashing consistency tests (those that test whether hash(n) == hash(BigFloat(n)) for integers n) on Python 2.5. In rare cases, this equality fails with Python 2.5, and this is awkward to fix. If this affects you, upgrade to Python 2.6 or avoid mixing BigFloat instances with ints in sets or dictionary keys.

What's new in bigfloat 0.1.2?

Library

  • Make Context objects hashable.

Documentation

  • Add 'where to get it' section to the documentation, pointing both to the PyPI page and the bitbucket source.
  • Expand installation information in documentation.

Packaging/distribution

  • Include html documentation in distribution, in docs directory.
  • Include INSTALL and CHANGELOG files in distribution.
  • Make sure the bigfloat_config.py file ends up in the top-level package directory.
  • Add /usr/lib{32,64} and /usr/local/lib{32,64} to default search paths in setup.py.