Time Window

Time Window is a small Python library that implements a representation for a period of time, in the form of a half-open interval [since, until).

Installation

Install using pip from PyPI.

pip install time-window

Usage

Instantiate a new TimeWindow object using two datetime.datetime objects for the boundaries.

>>> from datetime import datetime
>>> from time_window import TimeWindow

>>> since = datetime(2019, 1, 23)
>>> until = datetime(2019, 1, 29)

>>> tw = TimeWindow(since, until)
>>> tw
TimeWindow(datetime.datetime(2019, 1, 23, 0, 0), datetime.datetime(2019, 1, 29, 0, 0))

Alternatively, instantiate a new TimeWindow object using a datetime.datetime object and one datetime.timedelta for the definition of the boundaries.

>>> from datetime import timedelta

>>> delta = timedelta(days=1)

>>> tw = TimeWindow.from_timedelta(since, delta)
>>> tw
TimeWindow(datetime.datetime(2019, 1, 23, 0, 0), datetime.datetime(2019, 1, 24, 0, 0))

Get the size of the window.

>>> tw.delta
datetime.timedelta(1)

Get the time that is in the middle of the window.

>>> tw.middle
datetime.datetime(2019, 1, 23, 12, 0)

You can also check if two TimeWindow objects overlap.

>>> tw = TimeWindow(datetime(2019, 1, 23), datetime(2019, 1, 29))
>>> tw2 = TimeWindow(datetime(2019, 1, 27), datetime(2019, 1, 30))
>>> tw.overlaps(tw2)
True

Complementary to the above action, you can check if two time windows are contiguous (i.e., adjacent, sharing one boundary).

>>> tw = TimeWindow(datetime(2019, 1, 23), datetime(2019, 1, 29))
>>> tw2 = TimeWindow(datetime(2019, 1, 20), datetime(2019, 1, 23))
>>> tw.contiguous(tw2)
[TimeWindow(datetime.datetime(2019, 1, 20, 0, 0), datetime.datetime(2019, 1, 23, 0, 0)),
 TimeWindow(datetime.datetime(2019, 1, 23, 0, 0), datetime.datetime(2019, 1, 29, 0, 0))]

>>> tw3 = TimeWindow(datetime(2019, 1, 20), datetime(2019, 1, 21))
>>> tw.contiguous(tw3)
False

Any TimeWindow object offers some of the standard set operations.

>>> tw = TimeWindow(datetime(2019, 1, 23), datetime(2019, 1, 29))
>>> tw2 = TimeWindow(datetime(2019, 1, 27), datetime(2019, 1, 30))

>>> tw.intersection(tw2)
TimeWindow(datetime.datetime(2019, 1, 27, 0, 0), datetime.datetime(2019, 1, 29, 0, 0))

>>> tw.union(tw2)
TimeWindow(datetime.datetime(2019, 1, 23, 0, 0), datetime.datetime(2019, 1, 30, 0, 0))

>>> tw.complement(tw2)
TimeWindow(datetime.datetime(2019, 1, 23, 0, 0), datetime.datetime(2019, 1, 27, 0, 0))

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.