[Tutor] Very wierd namespace problem

[Amit Sethi]

I am not able to understand this , perhaps it is an aspect of python I
do not understand ....

Now usually I would think that for a class
class a:
...     def __init__(self):
...             pass
...     def __something__(self):
...             pass

>>> b=a()
>>> dir(b)
['__doc__', '__init__', '__module__', '__something__']


This should be correct .... so now i can refer one of these functions
from the object of the same class as obj.__something__()
now I have created a class with some functions defined in it but the
thing is that they are named in a completely different manner?????(or
so I think)

<__main__.SmPriceWindow instance at 0x9dd448c>
['_SmPriceWindow__add_columns', '_SmPriceWindow__create_model',
'_SmPriceWindow__review_button_click', '_SmPriceWindow__show_all',
'_SmPriceWindow__url_button_click', '__doc__', '__init__',
'__module__', 'model', 'tree', 'window']
Traceback (most recent call last):
  File "smnotebook3.py", line 135, in price_button_pressed
    sw.__show_all()
AttributeError: SmPriceWindow instance has no attribute '__show_all'

I have refered to these functions(__add_columns ,__create_model etc
... as self.__add_columns as would be expected in the class itself  )

This functionality is unexpected according to me ....

Since I cannot take much of the space here explaining the code I have
pasted here:
http://pastebin.com/mddf7a43


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