Need help with Python scoping rules

[Ulrich Eckhardt]

Ulrich Eckhardt wrote:
> Jean-Michel Pichavant wrote:
>> class Color:
>>     def __init__(self, r, g,b):
>>           pass
>>     BLACK = Color(0,0,0)
>> 
>> It make sens from a design point of view to put BLACK in the Color
>> namespace. But I don't think it's possible with python.
> 
> class Color:
>     ...
> 
> setattrib(Color, "BLACK", Color(0,0,0))

Apart from it being "setattr" and not "setattrib", a simple

  Color.BLACK = Color(0,0,0)

should have done the job here. However, what I had in mind was this:

  class Color:
      _colors = [ ("BLACK", (0,0,0)),
                  ("WHITE", (1,1,1))
                ]

      def __str__(self):
          # try to locate a name
          for name, rgb in Color._colors:
              if self.rgb==rgb:
                  return name
          # no name found, just format as a triplet
          return "(%s, %s, %s)" % self.rgb

  # add symbolic names
  for name, rgb in Color._colors:
      setattr(Colors, name, Color(rgb))


...which I got as suggestion on my question how to model C enumeration
lookalikes.

Uli

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