I recommend using the newer python-intervals library instead

Pyinter is a small and simple library written in Python for performing interval and discontinous range arithmetic.

>>> pyinter.openclosed(1.1, 12)
(1.1, 12]
>>> discontinous_range = pyinter.IntervalSet([pyinter.closedopen(5, 10), pyinter.closed(22, 23)])
>>> discontinous_range
IntervalSet([5, 10), [22, 23])
>>> 7 in discontinous_range
True
>>> 10 in discontinous_range
False  # This isn't in the range as it is an open interval which doesn't include its end points

• interval objects which can be
  • unioned
  • intersected
  • easily constructed using helper functions: open, closed, openclosed and closedopen
• interval sets which can be
  • unioned
  • intersected

To install Pyinter, simply:

$ pip install pyinter

Or, if you absolutely must:

$ easy_install pyinter

But I'm told you really shouldn't do that.

Documentation is available at http://pyinter.readthedocs.org.

Contributions or suggestions for improvements are welcome.