# singleton_meta (v0.1.2)
## DESCRIPTION_SHORT
create perfect singletons
## DESCRIPTION_LONG
designed for singletons creation
## Features
1. perfect singleton (maybe thread safe!)
2. collect all instances
3. check correct instantiating singletons in tree project
********************************************************************************
## License
See the [LICENSE](LICENSE) file for license rights and limitations (MIT).
## Release history
See the [HISTORY.md](HISTORY.md) file for release history.
## Installation
```commandline
pip install singleton-meta
```
## Import
```python
from singleton_meta import *
```
********************************************************************************
## USAGE EXAMPLES
See tests and sourcecode for other examples.
------------------------------
### 1. example1.py
```python
from singleton_meta import *
class MySingleton(SingletonByCallMeta):
pass
class MySingleton2(SingletonByCallMeta):
pass
class MySingleton(metaclass=SingletonMetaCallClass):
pass
# ===============================
# 2. access to created instances
from singleton_meta import *
class Victim1(SingletonByCallMeta):
attr = 1
class Victim2(SingletonByCallMeta):
attr = 2
assert SingletonByCallMeta._SINGLETONS == []
Victim1()
assert SingletonByCallMeta._SINGLETONS == [Victim1(), ]
assert Victim1._SINGLETONS == [Victim1(), ]
assert Victim1()._SINGLETONS == [Victim1(), ]
Victim2()
assert SingletonByCallMeta._SINGLETONS == [Victim1(), Victim2(), ]
# ===============================
# 3. NOTICE: all your Singletons must be only last classes!
# don't use nesting from any Your Singletons!
from singleton_meta import *
class MySingleton(SingletonByCallMeta): # OK
pass
class MySingleton2(MySingleton): # WRONG
pass
```
********************************************************************************
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"description": "# singleton_meta (v0.1.2)\r\n\r\n## DESCRIPTION_SHORT\r\ncreate perfect singletons\r\n\r\n## DESCRIPTION_LONG\r\ndesigned for singletons creation\r\n\r\n\r\n## Features\r\n1. perfect singleton (maybe thread safe!) \r\n2. collect all instances \r\n3. check correct instantiating singletons in tree project \r\n\r\n\r\n********************************************************************************\r\n## License\r\nSee the [LICENSE](LICENSE) file for license rights and limitations (MIT).\r\n\r\n\r\n## Release history\r\nSee the [HISTORY.md](HISTORY.md) file for release history.\r\n\r\n\r\n## Installation\r\n```commandline\r\npip install singleton-meta\r\n```\r\n\r\n\r\n## Import\r\n```python\r\nfrom singleton_meta import *\r\n```\r\n\r\n\r\n********************************************************************************\r\n## USAGE EXAMPLES\r\nSee tests and sourcecode for other examples.\r\n\r\n------------------------------\r\n### 1. example1.py\r\n```python\r\nfrom singleton_meta import *\r\n\r\nclass MySingleton(SingletonByCallMeta):\r\n pass\r\n\r\nclass MySingleton2(SingletonByCallMeta):\r\n pass\r\n\r\nclass MySingleton(metaclass=SingletonMetaCallClass):\r\n pass\r\n\r\n\r\n# ===============================\r\n# 2. access to created instances\r\nfrom singleton_meta import *\r\n\r\nclass Victim1(SingletonByCallMeta):\r\n attr = 1\r\n\r\nclass Victim2(SingletonByCallMeta):\r\n attr = 2\r\n\r\nassert SingletonByCallMeta._SINGLETONS == []\r\nVictim1()\r\nassert SingletonByCallMeta._SINGLETONS == [Victim1(), ]\r\nassert Victim1._SINGLETONS == [Victim1(), ]\r\nassert Victim1()._SINGLETONS == [Victim1(), ]\r\nVictim2()\r\nassert SingletonByCallMeta._SINGLETONS == [Victim1(), Victim2(), ]\r\n\r\n\r\n# ===============================\r\n# 3. NOTICE: all your Singletons must be only last classes!\r\n# don't use nesting from any Your Singletons!\r\nfrom singleton_meta import *\r\n\r\nclass MySingleton(SingletonByCallMeta): # OK\r\n pass\r\n\r\nclass MySingleton2(MySingleton): # WRONG\r\n pass\r\n```\r\n\r\n********************************************************************************\r\n",
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