Python default arguments/attributes

Hey /prog/,
What's best practice when overriding defaults with arguments?

How do you do it?

Either way, it seems like a lot of boilerplate code.



class foo(object):
    bar = 5
    baz = 3


    def __init__(bar=None, baz=None, boo=1):

        # what if there are more possible values?
        self.bar = self.bar if bar is None else bar
       
        # what if baz isn't None, but evaluates to False?
        self.baz = baz or self.baz

        self.boo = boo

>>7
Bullshit. There's no case in which >>6 would not work.