derange 0.1.0

Installation

derange is written in pure Python 3 with no dependencies. Just use pip for Python 3 (You have pip, right?) to install:

python3 -m pip install derange

Examples

Condense commit years obtained from git log or the like into range objects:

>>> import derange
>>> derange.derange([2015, 2015, 2015, 2014, 2014, 2011, 2010, 2010, 2009, 2009])
[range(2009, 2012), range(2014, 2016)]

If the input is already sorted, you can condense it slightly faster with derange_sorted:

>>> derange.derange_sorted([2009, 2009, 2010, 2010, 2011, 2014, 2014, 2015, 2015, 2015])
[range(2009, 2012), range(2014, 2016)]

Organize non-integer values into closed intervals (represented as pairs of endpoints) with deinterval:

>>> import datetime
>>> # deinterval() requires a callable for determining when two values are "adjacent":
>>> def within_24_hours(a,b):
...     return abs(a-b) <= datetime.timedelta(hours=24)
...
>>> timestamps = [
...     datetime.datetime(2017, 11, 2, 12, 0),
...     datetime.datetime(2017, 11, 3, 11, 0),
...     datetime.datetime(2017, 11, 4, 10, 0),
...     datetime.datetime(2017, 11, 5,  9, 0),
...     datetime.datetime(2017, 11, 6,  9, 0),
...     datetime.datetime(2017, 11, 7, 10, 0),
... ]
>>> derange.deinterval(within_24_hours, timestamps)
[(datetime.datetime(2017, 11, 2, 12, 0), datetime.datetime(2017, 11, 6, 9, 0)), (datetime.datetime(2017, 11, 7, 10, 0), datetime.datetime(2017, 11, 7, 10, 0))]

… which also has a deinterval_sorted variant:

>>> derange.deinterval_sorted(within_24_hours, timestamps)
[(datetime.datetime(2017, 11, 2, 12, 0), datetime.datetime(2017, 11, 6, 9, 0)), (datetime.datetime(2017, 11, 7, 10, 0), datetime.datetime(2017, 11, 7, 10, 0))]
>>> derange.deinterval_sorted(within_24_hours, reversed(timestamps))
Traceback (most recent call last):
    ...
ValueError: sequence not in ascending order