Question

closedset = set()    


root = (5,6)

for u,v in root:
    if v is not closedset:
       closedset.add(root)
       print closedset

Error:

for u,v in root:

TypeError: unpack non-sequence

What should i do with type of error?

Answer 1

I’m not sure I understand what you’re trying to do. Maybe:

roots = [(5, 6), (2, 3)]

for u, v in roots:
  if f not in closed:
    closed.add(v)
    print closed

Note a few changes:

• roots is now a list of tuples. for u, v in roots will correctly “unpack” each tuple into u and v
• by if v is not closed your probably meant if f not in closed, if closed is a dictionary of some kind
• if close.add is a method (of a set?), then it has to be called with parens () and not brackets ()