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Issue 3412: Mention fractions and decimal in the tutorial section on floating point.

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Raymond Hettinger 2008-10-05 17:57:52 +00:00
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Doc/tutorial/floatingpoint.rst
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@ -135,6 +135,14 @@ display of your final results to the number of decimal digits you expect.
:func:`str` usually suffices, and for finer control see the :meth:`str.format`
method's format specifiers in :ref:`formatstrings`.
For use cases which require exact decimal representation, try using the
:mod:`decimal` module which implements decimal arithmetic suitable for
accounting applications and high-precision applications.
Another form of exact arithmetic is supported by the :mod:`fractions` module
which implements arithmetic based on rational numbers (so the numbers like
1/3 can be represented exactly).
If you are a heavy user of floating point operations you should take a look
at the Numerical Python package and many other packages for mathematical and
statistical operations supplied by the SciPy project. See <http://scipy.org>.