Physical quantities module
Project description
Pint: a Python units library
Pint is Python module/package to define, operate and manipulate physical quantities: the product of a numerical value and a unit of measurement. It allows arithmetic operations between them and conversions from and to different units.
It is distributed with a comprehensive list of physical units, prefixes and constants. Due to it’s modular design, you to extend (or even rewrite!) the complete list without changing the source code.
It has a complete test coverage. It runs in Python 2.7 and 3.X with no other dependency. It licensed under BSD.
Design principles
Although there are already a few very good Python packages to handle physical quantities, no one was really fitting my needs. Like most developers, I programed Pint to scratch my own itches.
Unit parsing: prefixed and pluralized forms of units are recognized without explicitly defining them. In other words: as the prefix kilo and the unit meter are defined, Pint understands kilometers. This results in a much shorter and maintainable unit definition list as compared to other packages.
Standalone unit definitions: units definitions are loaded from simple and easy to edit text file. Adding and changing units and their definitions does not involve changing the code.
Advanced string formatting: a quantity can be formatted into string using PEP 3101 syntax. Extended conversion flags are given to provide latex and pretty formatting.
Small codebase: small and easy to maintain with a flat hierarchy.
Dependency free: it depends only on Python and it’s standard library.
Python 2 and 3: A single codebase that runs unchanged in Python 2.7+ and Python 3.0+.
Advanced NumPy support: While NumPy is not a requirement for Pint, when available ndarray methods and ufuncs can be used in Quantity objects.
Pint is written and maintained by Hernan E. Grecco <hernan.grecco@gmail.com>.
Other contributors, listed alphabetically, are:
Richard Barnes <rbarnes@umn.edu>
Alexander Böhn <fish2000@gmail.com>
Dave Brooks <dave@bcs.co.nz>
Giel van Schijndel <me@mortis.eu>
Daniel Sokolowski <moc.buhtig@danols.com>
Brend Wanders <b.wanders@utwente.nl>
Pint Changelog
0.3.3 (2013-11-29)
ParseHelper can now parse units named like python keywords. (Issue #69)
Fix comparison of quantities. (Issue #74)
Fix Inequality operator. (Issue #70)
0.3.2 (2013-10-22)
Fix get_dimensionality for non multiplicative units. (Issue #66)
Proper handling of @import directive inside a file read using pkg_resources. (Issue #68)
0.3.1 (2013-09-15)
fix right division on python 2.7 (Issue #58, thanks natezb)
fix formatting of fractional exponentials between 0 and 1. (Issue #62, thanks jdreaver)
fix installation as egg. (Issue #61)
fix handling of strange values as input of Quantity. (Issue #53)
math operations between quantities of different registries now raise a ValueError. (Issue #52)
0.3 (2013-09-02)
support for IPython autocomplete and rich display. (Issues #30 and #31)
support for @import directive in definitions file. (Issue #22)
support for wrapping functions to make them pint-aware. (Issue #16)
support for comparing UnitsContainer to string. (Issue #35)
fix error raised while converting from a single unit to one expressed as the relation between many. (Issue #29)
fix error raised when unit symbol is missing. (Issue #41)
fix error raised when magnitude is Decimal. (Issue #46, thanks danielsokolowski)
support for non-installed pint. (Issue #42, thanks danielsokolowski)
support for application of numpy function on non-ndarray magnitudes. (Issue #44)
support for math operations on dimensionless Quantities (written with units). (Issue #45)
fix obtaining dimensionless quantity from string. (Issue #50)
fix adding and comparing numbers to a dimensionless quantity (written with units). (Issue #54)
Support for iter in Quantity. (Issue #55, thanks natezb)
0.2.1 (2013-07-02)
fix error raised while converting from a single unit to one expressed as the relation between many. (Issue #29)
0.2 (2013-05-13)
support for Measurement (Quantity +/- error).
implemented buckingham pi theorem for dimensional analysis.
support for temperature units and temperature difference units.
parser can infers if the user mean temperature or temperature difference.
support for derived dimensions (e.g. [speed] = [length] / [time]).
refactored the code into multiple files.
refactored code to isolate definitions and converters.
refactored formatter out of UnitParser class.
added tox and travis config files for CI.
comprehensive NumPy testing including almost all ufuncs.
full NumPy support (features is not longer experimental).
fixed bug preventing from having independent registries. (Issue #10, thanks bwanders)
forces real division as default for Quantities. (Issue #7, thanks dbrnz)
improved default unit definition file. (Issue #13, thanks r-barnes)
smarter parser supporting spaces as multiplications and other nice features. (Issue #13, thanks r-barnes)
moved testsuite inside package.
short forms of binary prefixes, more units and fix to less than comparison. (Issue #20, thanks muggenhor)
pint is now zip-safe (Issue #23, thanks muggenhor)
Version 0.1.3 (2013-01-07)
abbreviated quantity string formating.
complete Python 2.7 compatibility.
implemented pickle support for Quantities objects.
extended NumPy support.
various bugfixes.
Version 0.1.2 (2012-08-12)
experimenal NumPy support.
included default unit definitions file. (Issue #1, thanks fish2000)
better testing.
various bugfixes.
fixed some units definitions. (Issue #4, thanks craigholm)
Version 0.1.1 (2012-07-31)
better packaging and installation.
Version 0.1 (2012-07-26)
first public release.
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