Question: Error or misconcept

[Károly Ladvánszky]

I have run into the following problems.

1.)

class c1:
    a1=[]
    def f1(self,a):
        self.a1.append(a)

def test1():
    o1=c1()
    o1.f1(99)

def test2():
    o1=c1()
    print o1.a1

Running test1(), test2(), in test2 I'd expect o1.a1 be []. This is not the
case, test2() prints [99] !
My guess is self.a1.append(a) modifies the class object's a1 member, not the
instance object's a1.
When a1 is a number,  everything goes as expected:

class c1:
    a1=0
    def f1(self,a):
        self.a1=(a)

def test1():
    o1=c1()
    o1.f1(99)

def test2():
    o1=c1()
    print o1.a1

Now test2() prints 0.

2.)

I thought of writing a tiny funtion that'd present a report on an object
given as parameter.
Processing the object's __dict__ special attribute seemed to be a good
choice.

It works fine for the class:

class c1:
    a1=0
    def f1(self,a):
        self.a1=(a)

c1.__dict__  ==> {'__doc__': None, '__module__': '__main__', 'f1': <function
f1 at 012E0BFC>, 'a1': 0}

Trying to use it for an object results in an empty dictionary:

o1=c1()
o1.__dict__  ==> {}

Referring to an attribute of o1 through the dictionary seems to sortof
refreshing the dictionary:

o1.__dict__['a1']=2
o1.__dict__ ==> {'a1': 2}

Is it a misconcept of mine about __dict__? If it is, what's the right way to
enlist an arbitrary object's attributes, methods?

I'm using ActivePython build 2.1.212
Thanks for any help.

Cheers,

Károly




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