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python Programming Glossary: cls._instancespython enumeration class for ORM purposes http://stackoverflow.com/questions/3588996/python-enumeration-class-for-orm-purposes values class EnumMeta type def __iter__ cls return cls._instances.itervalues class EnumType object __metaclass__ EnumMeta _instances.. instances dict value cls value for value in values cls._instances instances def __new__ cls value raise TypeError 'No more instances..
Creating a singleton in python http://stackoverflow.com/questions/6760685/creating-a-singleton-in-python type _instances def __call__ cls args kwargs if cls not in cls._instances cls._instances cls super Singleton cls .__call__ args kwargs.. def __call__ cls args kwargs if cls not in cls._instances cls._instances cls super Singleton cls .__call__ args kwargs return cls._instances.. cls super Singleton cls .__call__ args kwargs return cls._instances cls #Python2 class MyClass BaseClass __metaclass__ Singleton..
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