I thought to understand the dir() function, but...

... when playing around with VPython I encountered the
following:

> >> from visual import *
Visual-2002-06-14
> >> s=sphere() # beautiful white sphere displayed immediately
> >> s
<Primitive object at 0x01563D34> 
> >> dir(s)
['__class__', 'axis', 'blue', 'color', 'constr',
 'display', 'frame', 'green', 'name', 'pos', 'radius',
'red', 'rotate', 'up', 'visible', 'x', 'y', 'z']
> >> s.__methods__
['rotate']
> >> s.__dict__
{'__class__': <built-in method sphere of tuple object at 0x00A65590> }
> >> s.__members__
['axis', 'blue', 'color', 'display', 'frame', 'green',
'pos', 'radius', 'red', 'up', 'visible', 'x', 'y', 'z']
> >> s.name
Traceback (most recent call last):
  File "<pyshell#7> ", line 1, in ?
    s.name
AttributeError: name
> >>

So, what are 'name' and 'constr', which both do not appear
neither in s.__members__ nor in s.__dict__ nor in s.__methods__,
but in the list returned by dir(s)?

(Or: what is generally returned by dir() ?)

Perhaps there is somebody who can explain this.

Thanks, Gregor


In other words: what happens in the following example, should not
happen in my understanding:

> >> from visual import *
Visual-2002-06-14
> >> s = sphere()
> >> for att in dir(s):
        print att, ':',
        print type(eval('s.'+att))


__class__ : <type 'instance'> 
axis : <type 'vector'> 
blue : <type 'float'> 
color : <type 'tuple'> 
constr :
Traceback (most recent call last):
  File "<pyshell#46> ", line 3, in ?
    print type(eval('y.'+att))
  File "<string> ", line 0, in ?
AttributeError: constr
> >>




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