It works on ranges.

View the Project on GitHub BrianHicks/cowboy

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pip install cowboy (you could use easy_install, but why would you?)

Installing for development

git clone
pip install -r requirements.txt
python develop

How to do stuff with Cowboy

Make a range:

import datetime
from cowboy import DateRange

first_quarter = DateRange(
    start=datetime(2012, 1, 1),
    end=datetime(2012, 3, 31)

See if an arbitrary value is within the range:

first_quarter.contains(datetime(2012, 2, 1)) # True

Step through all the values in the range:

from cowboy import NumberRange

one_through_ten = NumberRange(1, 10)

one_through_ten.steps(granularity=1) # Generator yielding [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Add two ranges:

from cowboy import NumberRange

fst, snd = NumberRange(1, 2), NumberRange(3, 4)

fst + snd # <NumberRange: 1 to 4>

Check validity of a range:

from cowboy import NumberRange

NumberRange(1, 2).is_valid # True
NumberRange(2, 1).is_valid # False

Make your own ranges

Say you wanted to make your own Range for chars, so that CharRange('a', 'c') made sense. That class would look something like this:

from cowboy.base import Range

class CharRange(Range):
    'a range of characters'
    def steps(self, granularity=1): # most subclasses will override just granularity
        current = ord(self.start)
        while current <= ord(self.end):
            yield chr(current)
            current += granularity

Now you can use all the methods outlined above to operate on ranges of characters.