moving items in a list

[Manuel M. Garcia]

def move_up(l, m):
    for i in range(1, len(l)):
        if l[i] in m:
            l[i-1],l[i] = l[i],l[i-1]

def move_down(l, m):
    for i in range(len(l) - 2, 0, -1):
        if l[i] in m:
            l[i],l[i+1] = l[i+1],l[i]

Manuel

On Tue, 7 Jan 2003 15:30:07 -0600, "Mark McEahern" <mark at mceahern.com>
wrote:
(edit)
>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
>
>def move_down(l, m):
>    """Move items in m found in l down one position."""
>    for i in range(len(l) - 1, 0, -1):
>        if i == len(l) - 1:
>            continue
>        item = l[i]
>        if item not in m:
>            continue
>        j = i + 1
>        swap_with = l[j]
>        l[i] = swap_with
>        l[j] = item