Question

How do I fix my Python code? The extend method in the last line is throwing exceptions :(

Answer 1

frontier = [[problem.getStartState()]]
explored = set()
while frontier:
node = frontier.pop()
if problem.isGoalState(node):
return node
explored.update(node)
print node
frontier.extend(child for child in problem.getSuccessors(node)
if child not in explored
and child not in frontier)
return None

Answer 2

what exception?

Answer 3

nonconforming operands or something

Answer 4

oh wait, are you trying to use a list comprehension? you forgot to put it inside [ and ]

Answer 5

!!!!!

Answer 6

it should say frontier([...])

Answer 7

i mean frontier.extend([ ... ])

Answer 8

the list comprehension syntax is [item.foo() for item in list]

Answer 9

hmm now it says ValueError

Answer 10

ValueError - Need more than 1 value to unpack

Answer 11

i think that means getSuccessors is returning a single value rather than a list

Answer 12

can't solve that without more context

Answer 13

how do I resolve this

Answer 14

there's no way to know with the information you've given me so far

Answer 15

I thought getSuccessors returns a list of tuples

Answer 16

that's a function you wrote, isn't it? i have no idea what it does

Answer 17

I didn't write this one myself I ripped it from a website

Answer 18

well either you're using it wrong or the function has a bug

Answer 19

I think I should stop copy-pasting random code off the internet hoping that one function works :-P