https://github.com/syntapy/singleton

Simple python singleton metaclass
https://github.com/syntapy/singleton

Last synced: 22 days ago
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Simple python singleton metaclass

• Host: GitHub
• URL: https://github.com/syntapy/singleton
• Owner: syntapy
• License: bsd-3-clause
• Created: 2021-08-12T15:01:35.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2021-09-24T05:12:50.000Z (over 3 years ago)
• Last Synced: 2023-07-02T02:10:58.827Z (over 1 year ago)
• Language: Python
• Size: 10.7 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
Makes any python class a singleton by calling

```python

from singleton import Singleton

class MyClass(metaclass=Singleton, Baseclasses...):

   pass

```

This is method 2 taken from [here](https://stackoverflow.com/questions/6760685/creating-a-singleton-in-python) but adapted to support separate instances for different constructor arguments

ToDo

----

Approaches to offer

- metaclass

- class decorator

- base class

Requirements are

- [ ] Singleton for each class for each combo of arguments

  - i.e. can have multiple instances of same class if they have different constructor arguments

  - [x] metaclass

  - [ ] class decorator

  - [ ] base class

- [ ] A separate object contains all instances of each class

  - Do not e.g. have a single dict containing every instances of the singleton (that is just bloated, and any bugs could leak out to other different classes

  - [ ] metaclass (probably not possible)

  - [ ] class decorator

  - [ ] base class