class-attributes

class Outer(object): class InnerBase(object): _var = {'foo', 'bar'} class Derived(InnerBase): _var = _var | {'baz'} # NameError: name '_var' is not defined _var = InnerBase._var | {'baz'} # name 'InnerBase' is not defined _var = Outer.InnerBase._var | {'baz'} # free variable 'Outer' # referenced before assignment in enclosing scope Moving _var in Outer does not help - moving it in module scope would work but defeats the purpose of having classes. So how to go about that ? EDIT: coming from Java so the scoping rules of classes are a head scratcher for me - a briefing would be appreciated. This

How does python differentiate a class attribute, instance attribute, and method when the names are the same? class Exam(object): test = "class var" def __init__(self, n): self.test = n def test(self): print "method : ",self.test test_o = Exam("Fine") print dir(test_o) print Exam.test print test_o.test test_o.test() Output : ['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'test'] <unbound

I need to dynamically create class attributes from a DEFAULTS dictionary. defaults = { 'default_value1':True, 'default_value2':True, 'default_value3':True, } class Settings(object): default_value1 = some_complex_init_function(defaults[default_value1], ...) default_value2 = some_complex_init_function(defaults[default_value2], ...) default_value3 = some_complex_init_function(defaults[default_value3], ...) I could also achive this by having sth. like __init__ for class creation, in order to dynamically create these attributes from dictionary and save a lot of code and stupid work. How would you

I have the following base class and subclass: class Event(object): def __init__(self, sr1=None, foobar=None): self.sr1 = sr1 self.foobar = foobar self.state = STATE_NON_EVENT # Event class wrappers to provide syntatic sugar class TypeTwoEvent(Event): def __init__(self, level=None): self.sr1 = level self.state = STATE_EVENT_TWO Further on in my code, I am inspecting an instance of a TypeTwoEvent class, checking for a field I know exists in the base class - I expected it to be defaulted to value None . However, my code raises the following exception: AttributeError: 'TypeTwoEvent' object has no

I'm writing a lightweight class whose attributes are intended to be publicly accessible, and only sometimes overridden in specific instantiations. There's no provision in the Python language for creating docstrings for class attributes, or any sort of attributes, for that matter. What is the accepted way, should there be one, to document these attributes? Currently I'm doing this sort of thing: class Albatross(object): """A bird with a flight speed exceeding that of an unladen swallow. Attributes: """ flight_speed = 691 __doc__ += """ flight_speed (691) The maximum speed that such a bird can