[Python-ideas] Calling a function of a list without accumulating results

[Ron Adam]

Terry Jones wrote:

> OK, how about "lack of choice"?  :-)

There's always a choice... Not always a good one though.   ;-)


> but you don't have a (simple) choice if you don't want to accumulate
> results.  I'm merely saying that I think it would be cleaner and more
> consistent to allow
> 
>     print(x) for x in range(5) if x % 2 == 0
> 
> instead of having the non-choice but to write something like
> 
>     for x in range(5):
>         if x % 2 == 0:
>             print x
> 


 >>> a = list(range(10))
 >>> def pr(obj):
...     print obj
...
 >>> a = list(range(10))
 >>> b = [1 for x in a if pr(x)]
0
1
2
3
4
5
6
7
8
9
 >>> b
[]


Or to be more specific to the above example...

 >>> b = [1 for x in range(5) if x % 2 == 0 and pr(x)]
0
2
4
 >>> b
[]


All of which are more complex then a simple for loop.


Cheers,
    Ron