Type error in python!

closedset = set()    


root = (5,6)

for u,v开发者_JAVA技巧 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?

root = [(5,6)]

...should work. for iterates through a list or set, returning first u, then v. If you want to return both parts of the set, you'll have to add itself to a list.

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 ()

root = ((5, 6),)

or

u, v = root

Depending on what your intentions are.

for u,v in [root]:
   print u,v

will do what you want.