https://github.com/tompaton/pymutator
SolidJS style updating of nested python objects
https://github.com/tompaton/pymutator
Last synced: 5 months ago
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SolidJS style updating of nested python objects
- Host: GitHub
- URL: https://github.com/tompaton/pymutator
- Owner: tompaton
- License: mit
- Created: 2022-06-11T12:09:49.000Z (about 4 years ago)
- Default Branch: main
- Last Pushed: 2022-06-12T10:33:32.000Z (about 4 years ago)
- Last Synced: 2025-10-29T00:47:56.418Z (8 months ago)
- Language: Python
- Size: 3.91 KB
- Stars: 1
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.rst
Awesome Lists containing this project
README
=========
PyMutator
=========
Mutate nested Python objects using a method inspired by SolidJS's
setState function for updating stores.
https://www.solidjs.com/docs/latest/api#updating-stores
Examples
========
update lists by index
>>> from pymutator import mutate
>>> mutate([1, 2, 3, 4, 5], 3, 'D')
[1, 2, 3, 'D', 5]
update lists by list of indices
>>> mutate([1, 2, 3, 4, 5], [1, 3], 'D')
[1, 'D', 3, 'D', 5]
update lists by filter predicate
>>> mutate([1, 2, 3, 4, 5], lambda i: i%2, 'odd')
['odd', 2, 'odd', 4, 'odd']
update list with computed value
>>> mutate([1, 2, 3, 4, 5], 3, lambda i: f'D{i}')
[1, 2, 3, 'D4', 5]
update dict
>>> mutate({'a': 1, 'b': 2, 'c': 3}, 'b', 'B')
{'a': 1, 'b': 'B', 'c': 3}
>>> mutate({'a': 1, 'b': 2, 'c': 3}, b='B')
{'a': 1, 'b': 'B', 'c': 3}
>>> mutate({'a': 1, 'b': 2, 'c': 3}, {'b': 'B'})
{'a': 1, 'b': 'B', 'c': 3}
>>> mutate({'a': 1, 'b': 2, 'c': 3}, ['b', 'x'], 'B')
{'a': 1, 'b': 'B', 'c': 3, 'x': 'B'}
update dict with filter predicate
>>> mutate({'a': 1, 'b': 2, 'c': 3}, lambda i: i%2, 'odd')
{'a': 'odd', 'b': 2, 'c': 'odd'}
update dict with computed value
>>> mutate({'a': 1, 'b': 2, 'c': 3}, 'b', lambda i: f'B{i}')
{'a': 1, 'b': 'B2', 'c': 3}
update object
>>> class O:
... def __init__(self): self.a = 1
>>> o = O()
>>> mutate(o, 'a', 2) and o.a
2
>>> mutate(o, a=3) and o.a
3
>>> mutate(o, {'a': 4}) and o.a
4
>>> mutate(o, 'a', lambda i: i+1) and o.a
5
updating nested objects
>>> store = {
... 'todos': [
... {'task': 'Finish work', 'completed': False},
... {'task': 'Go grocery shopping', 'completed': False},
... {'task': 'Make dinner', 'completed': False},
... ]
... }
>>> mutate(store, 'todos', [0, 2], 'completed', True)
{'todos': [{'task': 'Finish work', 'completed': True}, {'task': 'Go grocery shopping', 'completed': False}, {'task': 'Make dinner', 'completed': True}]}
>>> mutate(store, 'todos', lambda todo: todo['completed'],
... 'task', lambda t: t + '!')
{'todos': [{'task': 'Finish work!', 'completed': True}, {'task': 'Go grocery shopping', 'completed': False}, {'task': 'Make dinner!', 'completed': True}]}
Running tests
=============
::
$ pytest