[Python-bugs-list] [ python-Bugs-595032 ] Tutorial: Section 9.6 - error in example

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Bugs item #595032, was opened at 2002-08-14 08:43
You can respond by visiting: 
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Category: Documentation
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Nathan Dimmock (ned21)
Assigned to: Fred L. Drake, Jr. (fdrake)
Summary: Tutorial: Section 9.6 - error in example

Initial Comment:
I couldn't get the following code from the tutorial
(section 9.6) to work. My local guru says the problem
is in the third line and probably used to work in a
previous version of python. (I'm using 2.2.1 on
RH-Linux 2.4.18)

# example code
class VirtualAttributes:
    __vdict = None
    __vdict_name = locals().keys()[0] # BROKEN
     
    def __init__(self):
        self.__dict__[self.__vdict_name] = {}
    
    def __getattr__(self, name):
        return self.__vdict[name]
    
    def __setattr__(self, name, value):
        self.__vdict[name] = value

# test code (added by user)
db = VirtualAttributes() # create an empty database
db.x = 1
print db.x

Trace:
Traceback (most recent call last):
  File "./classTest.py", line 19, in ?
    db.x = 1
  File "./classTest.py", line 16, in __setattr__
    self.__vdict[name] = value
TypeError: object does not support item assignment


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>Comment By: Fred L. Drake, Jr. (fdrake)
Date: 2002-08-14 11:28

Message:
Logged In: YES 
user_id=3066

I've removed the obsolete example from Doc/tut/tut.tex 1.169
and 1.156.4.1.2.9.

The rules for private names were introduced well before
Python 2.0, and it is not reasonable for the tutorial to
cater to versions that old.

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