Deleting from a list

[Jason Orendorff]

> My question: Is there a cleaner way to do all this? Having 2 loops seems
> to be ugly.

i = 0
while i < len(lines):
    line = lines[i]
    ...
    if should_delete_this(line):
        del lines[i]
        continue          # This intentionally doesn't increment i.
    ...
    i += 1

But I usually just build the result list as I go instead.  It's clearer.

ok_lines = []
for line in lines:
    ...
    ...
    if ok(line):
        ok_lines.append(line)


## Jason Orendorff    http://www.jorendorff.com/