The cdecimal package is a fast drop-in replacement for the decimal module
in Python's standard library. Both modules provide complete implementations of
Mike Cowlishaw/IBM's General Decimal Arithmetic Specification.
Both cdecimal and the underlying library - libmpdec - are extremely
well tested. libmpdec is one of the few open source projects with 100%
code coverage. cdecimal is rigorously tested against decimal.py.
Typical performance gains are between 30x for I/O heavy benchmarks and 80x for numerical programs. In a database benchmark, cdecimal exhibits a speedup of 12x over decimal.py.
+---------+-------------+--------------+-------------+ | | decimal | cdecimal | speedup | +=========+=============+==============+=============+ | pi | 42.75s | 0.58s | 74x | +---------+-------------+--------------+-------------+ | telco | 172.19s | 5.68s | 30x | +---------+-------------+--------------+-------------+ | psycopg | 3.57s | 0.29s | 12x | +---------+-------------+--------------+-------------+
Since cdecimal is compatible with decimal.py, the official documentation
is valid. For the few remaining differences, refer to the second link.
Decimal module <http://docs.python.org/dev/py3k/library/decimal.html>_Differences between cdecimal and decimal <http://www.bytereef.org/mpdecimal/doc/cdecimal/index.html>_The build process requires a working C compiler and a full Python install with development headers. Linux distributions often ship the Python header files as a separate package, called python-dev or python-devel.
Install headers on Debian/Ubuntu:
sudo apt-get install python-devBinary installers <http://www.bytereef.org/mpdecimal/download.html>_cdecimal project homepage <http://www.bytereef.org/mpdecimal/index.html>_cdecimal benchmarks <http://www.bytereef.org/mpdecimal/benchmarks.html>_FAQs
Fast arbitrary precision correctly-rounded decimal floating point arithmetic.
We found that m3-cdecimal demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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