history-set 0.1.3

A Set implementation that tracks added and removed elements.

A Set implementation that tracks added and removed elements.

Usage

>>> from history_set import HistorySet
>>> history_set = HistorySet([1, 2, 3])
>>> history_set.add(4)
>>> history_set                   # Prints: {1, 2, 3, 4}
>>> history_set.added()           # Prints: {4}
>>> history_set.remove(1)
>>> history_set                   # Prints: {2, 3, 4}
>>> history_set.removed()         # Prints: {1}
>>> history_set.reset()
>>> history_set.added()           # Prints: set()
>>> history_set.removed()         # Prints: set()

Special case

By default, if an element is added and later removed, it will not be tracked in history

>>> history_set = HistorySet([1, 2, 3])
>>> history_set.add(4)
>>> history_set.remove(4)
>>> history_set.added()           # Prints: set()
>>> history_set.removed()         # Prints: set()

If you require these elements to be tracked, you can construct the object with the eidetic keyword argument

>>> history_set = HistorySet([1, 2, 3], eidetic=True)
>>> history_set.add(4)
>>> history_set.remove(4)
>>> history_set.added()           # Prints: {4}
>>> history_set.removed()         # Prints: {4}

---

By default, the reset() method will clear the entire history

>>> history_set = HistorySet([1, 2, 3])
>>> history_set.add(4)
>>> history_set.added()           # Prints: {4}
>>> history_set.remove(2)
>>> history_set.removed()         # Prints: {2}
>>> history_set.reset()
>>> history_set.added()           # Prints: set()
>>> history_set.removed()         # Prints: set()

If you require reseting only the added() or removed() history, you can call the reset method with added or removed booleans values to specify which history you with to reset

>>> history_set = HistorySet([1, 2, 3])
>>> history_set.add(4)
>>> history_set.added()           # Prints: {4}
>>> history_set.remove(2)
>>> history_set.removed()         # Prints: {2}
>>> history_set.reset(added=True)
>>> history_set.added()           # Prints: set()
>>> history_set.removed()         # Prints: {2}

Test

You can run the tests using tox

tox

Publish

To publish a new version of this package your Pypi user needt to be added to the project. (Ask Tjaart to give you access)

# Update version number in setup.py

python setup.py sdist
twine upload dist/*