i have wrote a python script but i have got an error because i have to make the lace longest.
how could i do that with python node ?
The python script node doesn’t support lacing. You’ve basically got two choices - either define a custom node with the correct input type (can be a tad slower):
or handle the lacing yourself:
Edit: just noticed you’re asking for longest lacing and not cross product. In that case, check out the izip_longest function:
from itertools import izip_longest a, b = IN OUT =  fill= a[-1] if len(a) > len(b) else b[-1] for i, j in izip_longest(a, b,fillvalue=fill): OUT.append(i + j)
that is so helpful, i will follow that
@Dimitar: Could you post a sample file please.
Thank you in advance Michael