Versioned Dictionaries

This package implements revision controlled dictionaries. Please see tests.py for usage and a full range of capabilities.

Installation

git clone https://andreacortis@bitbucket.org/andreacortis/versioned_dictionary.git
cd versioned_dictionary
pip install -e .

Usage

In [1]: from versioned_dictionary import VersionedDict, Change

In [2]: D = {'a':1, 'b':{'c':3, 'd':4}}

In [3]: T = VersionedDict(name="my_dict", root_object=D)

In [4]: print(T)

--------------------------------------------------------------------------------
=== VersionedDict ===
name         : my_dict
dict         : {"a": 1, "b": {"c": 3, "d": 4}}
root         : 4b85a0bcc5e535f29ab263b7691ba7851a9a11b36e65b811e0d0b94c
state        : 4b85a0bcc5e535f29ab263b7691ba7851a9a11b36e65b811e0d0b94c
creation time: 2020-04-02 12:00:41.531372
last modified: None

In [5]: print(T['b.c'])
3

In [6]: print(T.root_object)
{'a': 1, 'b': {'c': 3, 'd': 4}}


In [7]: c1 = Change(VersionedDict_root_hash=T.root_hash, state=T.current_state(), verb='set', key='a', to='17')

In [8]: print(c1)
--------------------------------------------------------------------------------
=== CHANGE ===
hash         : 5bfc003ac2c3498e2c997973b6d008b10e9c56e8307db697efa9c075
VersionedDict hash : 4b85a0bcc5e535f29ab263b7691ba7851a9a11b36e65b811e0d0b94c
state        : 4b85a0bcc5e535f29ab263b7691ba7851a9a11b36e65b811e0d0b94c
verb         : set
key          : a
to           : 17
applied      : False
time         : None
old_value    : None
end_state    : None
--------------------------------------------------------------------------------

In [9]: T.apply_change(c1)

In [10]: print(T)
--------------------------------------------------------------------------------
=== VersionedDict ===
name         : my_dict
dict         : {"a": "17", "b": {"c": 3, "d": 4}}
root         : 4b85a0bcc5e535f29ab263b7691ba7851a9a11b36e65b811e0d0b94c
state        : 1def039e9ee1e6e7e266026c0db0101ea51b06266487085775f20454
creation time: 2020-04-02 12:00:41.531372
last modified: 2020-04-02 12:02:33.487806

In [11]: T.apply_change(-c1)

In [12]: print(T)
--------------------------------------------------------------------------------
=== VersionedDict ===
name         : my_dict
dict         : {"a": 1, "b": {"c": 3, "d": 4}}
root         : 4b85a0bcc5e535f29ab263b7691ba7851a9a11b36e65b811e0d0b94c
state        : 4b85a0bcc5e535f29ab263b7691ba7851a9a11b36e65b811e0d0b94c
creation time: 2020-04-02 12:00:41.531372
last modified: 2020-04-02 12:06:01.461169

In [13]: T.revert_to_state('1def039e9ee1e6e7e266026c0db0101ea51b06266487085775f20454')

In [14]: print(T)
--------------------------------------------------------------------------------
=== VersionedDict ===
name         : my_dict
dict         : {"a": "17", "b": {"c": 3, "d": 4}}
root         : 4b85a0bcc5e535f29ab263b7691ba7851a9a11b36e65b811e0d0b94c
state        : 1def039e9ee1e6e7e266026c0db0101ea51b06266487085775f20454
creation time: 2020-04-02 12:00:41.531372
last modified: 2020-04-02 12:06:31.850728


In [15]: print(T.states_history)
['4b85a0bcc5e535f29ab263b7691ba7851a9a11b36e65b811e0d0b94c',
'1def039e9ee1e6e7e266026c0db0101ea51b06266487085775f20454',
'4b85a0bcc5e535f29ab263b7691ba7851a9a11b36e65b811e0d0b94c',
'1def039e9ee1e6e7e266026c0db0101ea51b06266487085775f20454']


In [16]: c2 = Change(VersionedDict_root_hash=T.root_hash, state=T.current_state(),verb='add', key='x', to='333')

In [17]: T.apply_change(c2)

In [18]: print(T)
--------------------------------------------------------------------------------
=== VersionedDict ===
name         : my_dict
dict         : {"a": "17", "b": {"c": 3, "d": 4}, "x": "333"}
root         : 4b85a0bcc5e535f29ab263b7691ba7851a9a11b36e65b811e0d0b94c
state        : d55e3f7557847e880b16e08c58eaffac2fc1ae3a69832ea3f5ae9417
creation time: 2020-04-02 12:00:41.531372
last modified: 2020-04-02 12:07:55.429116


In [19]: c3 = Change(VersionedDict_root_hash=T.root_hash, state=T.current_state(),verb='del', key='a', to='None')

In [20]: T.apply_change(c3)

In [21]: print(T)
--------------------------------------------------------------------------------
=== VersionedDict ===
name         : my_dict
dict         : {"b": {"c": 3, "d": 4}, "x": "333"}
root         : 4b85a0bcc5e535f29ab263b7691ba7851a9a11b36e65b811e0d0b94c
state        : 2ba85ba75a7e67fbe32dd928fd653998f4c0cb534d48c5967d10b9bd
creation time: 2020-04-02 12:00:41.531372
last modified: 2020-04-02 12:08:47.112648