In http://docs.python.org/py3k/tutorial/stdlib2.html#logging , some code in a code sample is missing ">>>".

The code is:

unsearched = deque([starting_node])
def breadth_first_search(unsearched):
    node = unsearched.popleft()
    for m in gen_moves(node):
        if is_goal(m):
            return m
        unsearched.append(m)


should be:
>>> unsearched = deque([starting_node])
>>> def breadth_first_search(unsearched):
>>>    node = unsearched.popleft()
>>>    for m in gen_moves(node):
>>>        if is_goal(m):
>>>            return m
>>>        unsearched.append(m)