Skip to main content

singleton(cls, [attr_name,] [disable_name_mangling,] [not_just_this_class,]) is cls

Project description

asingleton

Run tests Upload release assets

>>> from asingleton import singleton

>>> print(singleton.__doc__)

    singleton(cls, 
                attr_name='instance', 
                disable_name_mangling=False, 
                not_just_this_class=False) -> cls

    singleton(attr_name='instance', 
                disable_name_mangling=False, 
                not_just_this_class=False)(cls) -> cls

    >>> @singleton
    ... class Service:
    ...     pass
    ... 
    >>> Service() is Service.instance
    True
    >>> Service()  # doctest: +ELLIPSIS, +NORMALIZE_WHITESPACE
    Traceback (most recent call last):
        ...
    AssertionError: There is already an instance of type <class '...Service'>;
    it can be accessed through the class attribute 'Service.instance'.

    >>> @singleton('__instance')
    ... class Service:
    ...     @classmethod
    ...     def get_instance(cls):
    ...         return cls.__instance
    ... 
    >>> Service() is Service.get_instance()
    True
    >>> Service.__instance
    Traceback (most recent call last):
        ...
    AttributeError: type object 'Service' has no attribute '__instance'

    >>> @singleton(not_just_this_class=True)
    ... class Service:
    ...     pass
    ... 
    >>> class Apache(Service):
    ...     pass
    ... 
    >>> Apache() is Apache.instance
    True
    >>> Apache()  # doctest: +ELLIPSIS, +NORMALIZE_WHITESPACE
    Traceback (most recent call last):
        ...
    AssertionError: There is already an instance of type <class '...Apache'>;
    it can be accessed through the class attribute 'Apache.instance'.

    >>> class Service:
    ...     def __new__(cls, *args, **kwargs):
    ...         """My custom __new__"""
    ...         return super().__new__(cls, *args, **kwargs)
    ...     original_new = __new__
    ... 
    >>> singleton(Service) is Service
    True
    >>> Service.__new__ is Service.original_new
    False
    >>> Service.__new__.__wrapped__ is Service.original_new
    True
    >>> Service.__new__.__doc__
    'My custom __new__'

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

asingleton-0.3.0.tar.gz (2.6 kB view details)

Uploaded Source

Built Distribution

asingleton-0.3.0-py3-none-any.whl (4.1 kB view details)

Uploaded Python 3

File details

Details for the file asingleton-0.3.0.tar.gz.

File metadata

  • Download URL: asingleton-0.3.0.tar.gz
  • Upload date:
  • Size: 2.6 kB
  • Tags: Source
  • Uploaded using Trusted Publishing? No
  • Uploaded via: twine/3.2.0 pkginfo/1.5.0.1 requests/2.24.0 setuptools/41.2.0 requests-toolbelt/0.9.1 tqdm/4.47.0 CPython/3.8.3

File hashes

Hashes for asingleton-0.3.0.tar.gz
Algorithm Hash digest
SHA256 31f6ff67973dea8c86f08dadb4fb4ee1ff2554150f89df986eb328345b98b66c
MD5 477900c6328d6acc825645b23bf607cd
BLAKE2b-256 738cf5ae0293cee54ac200d994fc610d0ee0759370ad0af133c32075b70649ea

See more details on using hashes here.

File details

Details for the file asingleton-0.3.0-py3-none-any.whl.

File metadata

  • Download URL: asingleton-0.3.0-py3-none-any.whl
  • Upload date:
  • Size: 4.1 kB
  • Tags: Python 3
  • Uploaded using Trusted Publishing? No
  • Uploaded via: twine/3.2.0 pkginfo/1.5.0.1 requests/2.24.0 setuptools/41.2.0 requests-toolbelt/0.9.1 tqdm/4.47.0 CPython/3.8.3

File hashes

Hashes for asingleton-0.3.0-py3-none-any.whl
Algorithm Hash digest
SHA256 4088f39da621b380e8473c5993e8fc5937ae5ce1cac38ba4914e712b8f583c3e
MD5 b2fc4abafc0ab9b08e437370ba732f6f
BLAKE2b-256 cb3b70c76c850ceda91558cc28bf524c1345ae36526c700c2187e53de7ff7fc3

See more details on using hashes here.

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page