New to Python

Stargaming stargaming at gmail.com
Mon Mar 12 10:42:50 CET 2007


Bert Heymans schrieb:
> On Mar 12, 3:02 am, Alberto Vieira Ferreira Monteiro
> <albm... at centroin.com.br> wrote:
> 
>>Hi, I am new to Python, how stupid can be the questions I ask?
>>
>>For example, how can I add (mathematically) two tuples?
>>x = (1,2)
>>y = (3,4)
>>How can I get z = (1 + 3, 2 + 4) ?
>>
>>Alberto Monteiro
> 
> 
> 
> Alberto -
> 
> List comprehesion, no doubt about it:
> 
>>>>z = [k+p for k,p in (x, y)]
>>>>z
> 
> [3, 7]
> 
> - Bert
> 

Since 1+3 is not really (only if you use rally bad approximations) 3 
(neither 2+4 is 7!), i'd rather prefer using zip:
 >>> x = (1,2)
 >>> y = (3,4)
 >>> [k+p for k,p in (x,y)] # wrong one
[3, 7]
 >>> [k+p for k,p in zip(x,y)] # zip-version
[4, 6]

What your's is doing is unpacking the contents of x first to k and p and 
adding them to each other and afterwards doing the same with y's contents.



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