“““{-
Copyright?（c）?2009?Pauli?Henrikki?Rikula?

Permission?is?hereby?granted?free?of?charge?to?any?person
obtaining?a?copy?of?this?software?and?associated?documentation
files?（the?“Software“）?to?deal?in?the?Software?without
restriction?including?without?limitation?the?rights?to?use
copy?modify?merge?publish?distribute?sublicense?and/or?sell
copies?of?the?Software?and?to?permit?persons?to?whom?the
Software?is?furnished?to?do?so?subject?to?the?following
conditions:

The?above?copyright?notice?and?this?permission?notice?shall?be
included?in?all?copies?or?substantial?portions?of?the?Software.

THE?SOFTWARE?IS?PROVIDED?“AS?IS“?WITHOUT?WARRANTY?OF?ANY?KIND
EXPRESS?OR?IMPLIED?INCLUDING?BUT?NOT?LIMITED?TO?THE?WARRANTIES
OF?MERCHANTABILITY?FITNESS?FOR?A?PARTICULAR?PURPOSE?AND
NONINFRINGEMENT.?IN?NO?EVENT?SHALL?THE?AUTHORS?OR?COPYRIGHT
HOLDERS?BE?LIABLE?FOR?ANY?CLAIM?DAMAGES?OR?OTHER?LIABILITY
WHETHER?IN?AN?ACTION?OF?CONTRACT?TORT?OR?OTHERWISE?ARISING
FROM?OUT?OF?OR?IN?CONNECTION?WITH?THE?SOFTWARE?OR?THE?USE?OR
OTHER?DEALINGS?IN?THE?SOFTWARE.
-}“““


import?heapq

class?NotImplemented（Exception）:
????pass


class?Map:
????def?__init__（self）:
????????pass
????def?heuristic_estimate_of_distance（self?startgoal）:
????????raise?NotImplemented
????def?neighbor_nodes（self?x）:
????????raise?NotImplemented

????def?dist_between（self?x?y）:
????????raise?NotImplemented

def?reconstruct_path（came_from?current_node）:
????if?current_node?in?came_from:
????????p?=?reconstruct_path（came_fromcame_from[current_node]）
????????return?p?+?[current_node]
????else:
????????return?[]


class?HeapItem:
????def?__init__（selfygoal?a_map）:
????????????
????????self.node?=?y
????????“““f_score?Estimated?total?distance?from?start?to?goal?through?y.“““
????????self.f_score?=?None
????????“““?g_score?=?Distance?from?start?along?optimal?path.“““
????????self.g_score?=?None

????????“““h_score?the?heuristic?estimates?of?the?distances?to?goal“““
????????self.h_score?=?a_map.heuristic_estimate_of_distance（y?goal）

????def?set_scores（selfg_score）:
????????self.g_score?=?g_score
????????self.f_score?=?self.h_score?+?self.g_score

????def?as_list（self）:
????????return?[self.f_score?self.g_score?self.h_score?self.node]


????def?__repr__（self）:
????????return?str（self.as_list（））

????def?type_check（selfother）:
????????return?type（self）?==?type（other）
????def?__lt__（self?other）:
????????return?self.type_check（other）?and?self.as_list（）.__lt__（other.as_list（））
????def?__le__（self?other）:
????????return?self.type_check（other）?and?self.as_list（）.__le__（other.as_list（））
????def?__eq__（self?other）:
????????return?self.type_check（other）?and?self.as_list（）.__eq__（other.as_list（））
????def?__ne__（self?other）:
????????return?self.type_check（other）?and?self.as_list（）.__ne__（other.as_list（））
????def?__gt__（self?other）:
????????return?self.type_check（other）?and?self.as_list（）.__gt__（other.as_list（））
????def?__ge__（self?other）:
????????return?self.type_check（other）?a

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????2218??2009-02-18?00:42??pathFinder.py

?????文件????????254??2009-02-18?00:43??a_map.txt

?????文件???????5063??2009-02-18?00:42??a_star.py

-----------?---------??----------?-----??----

?????????????????7535????????????????????3