Quantities package for the python programming language
Python Other
Latest commit 39d9b4a Jan 13, 2016 @ddale ddale Merge pull request #98 from bjodah/more_ufuncs
More ufuncs (fixes #76)



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A Python package for handling physical quantities. The source code and issue tracker are hosted on github:



Get the latest version of quantities from https://pypi.python.org/pypi/quantities/

To get the git version do:

$ git clone git://github.com/python-quantities/python-quantities.git

Documentation and usage

You can find the official documenation at:


Here is a simple example:

>>> import quantities as pq
>>> distance = 42*pq.metre
>>> time = 17*pq.second
>>> velocity = distance / time
>>> velocity
array(2.4705882352941178) * m/s
>>> velocity + 3
Traceback (most recent call last):
ValueError: Unable to convert between units of "dimensionless" and "m/s"


quantities has a hard dependency on the NumPy library. You should install it first, please refer to the NumPy installation guide:


To install quantities itself, then simply run:

$ python setup.py install --user

If you install it system-wide, you may need to prefix the previous command with sudo:

$ sudo python setup.py install


To execute all tests, run:

$ python setup.py test

in the current directory. The master branch is automatically tested by Travis CI.


quantities is written by Darren Dale


Quantities only uses BSD compatible code. See the Open Source Initiative licenses page for details on individual licenses.

See doc/user/license.rst for further details on the license of quantities