Iterating over several lists at once

[Mike Erickson]

* at (at at tuko.nl) wrote:
> Sorry for breaking into this thread, but I agree completely that any
> unnecessary indentations should be avoided. For the same reason I advocate
> that the following syntax should work:
> 
>         for x in some_list if some_condition:
>                 ... code ...
> 
> in stead of 
> 
>         for x in some_list 
>                 if some_condition:
>                         ... code ...

It is possible to avoid the extra level of indentaion, but I think it's
much less readable than the 2-level verbose expresion:

>>> a
[1, 2, 3, 4, 5, 6, 7]
>>> for odd in (num for num in a if num % 2 == 1):
...     print odd
... 
1
3
5
7

there is also continue, which I think is a good compromise:

>>> for num in a:
...     if num % 2 == 0:
...             continue
...     print num
...
1
3
5
7

HTH (and not lead astray),

mike