moving items in a list

[Cliff Wells]

On Tue, 2003-01-07 at 13:30, Mark McEahern wrote:
> Below is some code and unit tests to demonstrate how I'm moving items in a
> list.  It works, but I'm sure I'll learn a lot by any feedback you care to
> offer.


> 
> def move_up(l, m):
>     """Move items in m found in l up one position."""
>     for i in range(len(l)):
>         if i == 0:
>             continue
>         item = l[i]
>         if item not in m:
>             continue
>         j = i - 1
>         swap_with = l[j]
>         l[i] = swap_with
>         l[j] = item


Here's an alternative.  Don't know if it's any better:

def move_up(l, m):
    """Move items in m found in l up one position."""
    for i in m:
        try:
            x = l.index(i)
            if x == 0:
                continue
            l[x-1], l[x] = l[x], l[x-1]
        except IndexError:
            continue




-- 
Cliff Wells, Software Engineer
Logiplex Corporation (www.logiplex.net)
(503) 978-6726 x308  (800) 735-0555 x308