class Test(): active_subs = [] def __init__(self, sub=None): Test.get_active_subs() if sub: Test.set_active_subs([sub]) @classmethod def set_active_subs(cls, sub): cls.active_subs.extend(sub) @classmethod def get_active_subs(cls): if not cls.active_subs: print 'setting default values' #logic for collecting available subs here cls.active_subs = ['default_1', 'default_2'] return cls.active_subs t1 = Test() print 'currently active subs t1=', t1.get_active_subs() t2 = Test('set_by_t2') print 'currently active subs t2=', t2.get_active_subs() print 'currently active subs t1=', t1.get_active_subs()
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