Newcomer to Python tutorial question

Peter Otten __peter__ at web.de
Thu May 7 20:58:49 CEST 2009


Alan Cameron wrote:

> I am not sure of this is the right place to ask a question about the
> tutorial
> 
> http://docs.python.org/3.0/tutorial/datastructures.html#sets
> 
> why is the printed result of
> 
>>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>>> print(basket)
> {'orange', 'banana', 'pear', 'apple'}
> 
> in the sequence given?

As already said by others, the order of items in a set is not part of the 
concept of a set. 

You can even have sets with equal contents that display differently:

Python 3.0.1+ (r301:69556, Apr 15 2009, 17:25:52)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> a = {'orange', 'banana', 'apple', 'orange', 'pear', 'apple'}
>>> b = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>> a == b
True
>>> repr(a) == repr(b)
False
>>> a
{'orange', 'pear', 'apple', 'banana'}
>>> b
{'orange', 'pear', 'banana', 'apple'}

Peter




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