Question about a single underscore.

[Steven W. Orr]

I saw this and tried to use it:

------------------><8------------------- const.py-------------
class _const:
     class ConstError(TypeError): pass
     def __setattr__(self,name,value):
         if self.__dict__.has_key(name):
             raise self.ConstError, "Can't rebind const(%s)"%name
         self.__dict__[name]=value

import sys
sys.modules[__name__]=_const()
------------------><8------------------- const.py-------------

Then when I go to try to use it I'm supposed to say:

const.pi        = 3.14159
const.e         = 2.7178


Two questions:

1. Why do I not have to say

_const.pi        = 3.14159
_const.e         = 2.7178

and is this in the tutorial?

2. Can I make this behave in such a way that I can create my constants 
with a classname that is different for different uses? e.g.,

irrational_const.pi        = 3.14159
irrational_const.e         = 2.7178

even_const.first	= 2
even_const.firstPlus	= 4

TIA

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