• Units in Python *
    1. 2000-2003 Pierre Denis *
    1. 2009-2010 Chris MacLeod *

* Visible changes since Unum 4.0:

  • installation requires a modern version of setuptools (you may need to update your setuptools before installing).
  • To support Python 2.5 and higher, the method Unum.as was renamed to Unum.asUnit; this was necessary since "as" became a reserved word. If you are still using old versions of Python, both names are available.
  • In addition to unit names in uppercase, unit names in the correct case are now available. So, both "kg" and "KG" refer to the kilogram Unum, and both "eV" and "EV" refer to the electron volt Unum.
  • Value types are no longer automatically coerced to floats. This allows the fractions.Fraction standard library type to be used, but may introduce incompatibilities with old code from integer vs. floating point division. In Python 3.x there is no problem.
  • Prefixed versions of the 7 base SI units are supplied. So you can use "cm", "ns", "kA", "mK", "pmol", "Mcd", and "g" out of the box.

* Prerequisites:

  • Python 2.2 or higher. Python 3.x should work as well, but please report any bugs.

* To install Unum:

  • unzip Unum installation files to any directory.
  • cd <install-directory>
  • python setup.py install this will install Unum packages in your Python site-packages directory i.e. it will create the directory <python-site-packages-dir>/unum
  • if the installation is successful (see below), you can safely remove <your-install-directory>
  • alternately, if you have setuptools installed you can do: "easy_install unum" to obtain it online from PyPI.
  • On Windows you may need to do "python -m easy_install unum" instead.
  • On Linux you may need to do "sudo easy_install unum".

* To run the test cases:

  • cd <install-directory>
  • python setup.py test

* Other information :

(for a comprehensive tutorial, papers, etc.)