huge slowdown on append

[ianaré]

On Dec 21, 3:29 pm, "ianaré" <ian... at gmail.com> wrote:
> Hey all,
>
> I have a for loop which included the line:
>
> items_ren.append(join(newPath,renamedItem))
>
> I changed it to this:
> items_ren.append([join(newPath,renamedItem), False])
>
> And processing speed is now much much slower. For 5780 items the old
> function would take 9.5 seconds (there is other stuff going on
> obviously), after changing that single line, speed is now 55 seconds
> in the same conditions!
>
> Can anyone give me some pointers please? I would like to keep the same
> structure if possible, as it allows the code in other places to be
> much faster. TIA
>
> BTW, the 'join' function is this:
> def join(newPath,renamedItem):
>             return unicode(os.path.join(newPath,renamedItem))

Seems like I found a way ... Use the old way, then at the end of the
for loop add the 'False'.
def addStatus(x):
    return (x,False)
items_ren = map(addStatus, items_ren)

9.5 seconds wOOt!

However, if anyone has a faster way, let me know!