Singleton Usage

singleton decorator that makes a class a singleton class

Example class that becomes a singleton class onece attribute is applied.

from kwhelp.decorator import singleton, RuleCheckAll
from kwhelp import rules

@singleton
class Logger:
    @RuleCheckAll(rules.RuleStrNotNullEmptyWs, ftype=DecFuncEnum.METHOD)
    def log(self, msg):
        print(msg)

All created instances are the same instance.

>>> logger1 = Logger()
>>> logger2 = Logger()
>>> print(logger1 is logger1)
True