我需要一些帮助来理解python概念.
class TilePuzzleProblem(search.Problem):
""" This class is the class for the NxN - blanks tile puzzle problem """
def __init__(self, N, blanks, initial, goal):
""" Initialize """
search.Problem.__init__(self, initial, goal)
self.N = N
self.blanks = blanks
def successor(self, state):
""" Generate the successors of the given state. Returns a list of (move, successor) pairs"""
abstract
def h(self, node):
abstract
目前代码挂在abstract函数的一部分h(...),但我不知道是什么abstract意思,因此无法理解问题是什么.