class.__subclasses__() 
Each class keeps a list of weak references to its immediate subclasses. This method returns a list of all those references still alive. Example:
>>> int.__subclasses__() [<class 'bool'>]
class.__subclasses__() 
Each class keeps a list of weak references to its immediate subclasses. This method returns a list of all those references still alive. Example:
>>> int.__subclasses__() [<class 'bool'>]
 
          
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