Data Tree urgent help!!!!!!

Peter Otten __peter__ at web.de
Wed Feb 20 11:46:33 CET 2013


Leo Breebaart wrote:

> Peter Otten <__peter__ at web.de> writes:
> 
>> >>> class Name(str):
>> ...     def __repr__(self):
>> ...             return self
>> ...
>> >>> apple, pear, dog, cat, fork, spoon = map(Name, "apple pear dog cat
>> >>> fork spoon".split())
> 
> Is there any reason why you introduced the Name class? In Python
> 2.7 this works equally well if I just do:
> 
>>>> apple, pear, dog, cat, fork, spoon = map(str, "apple pear dog cat fork
>>>> spoon".split())
> 
> So I was wondering why you used Name.

It was more for fun than profit ;) The OP gave  

[apple, dog, fork]

in his examples, and the "normal" no-nonsense approach using a list of 
strings would produce

['apple', 'dog', 'fork']

I was tempted to carry this even further with

>>> class Name(str):
...     def __repr__(self): return self
... 
>>> class Namespace(dict):
...     def __missing__(self, key):
...             self[key] = result = Name(key)
...             return result
... 
>>> fruit, pets, cutlery = eval("[apple, pear], [dog, cat], [fork, spoon]", 
Namespace())
>>> fruit
[apple, pear]

but resisted until now...




More information about the Python-list mailing list