gistfile1.txt

import wikipedia, sys

def AStar(start, goal):
	closedset = []
	openset = [trypage(link) for link in start.links]
	navigated = {}

	g_score = lambda start: 0
	f_score = lambda start: g_score(start) + heuristic_cost(start, goal)

	while openset != []:
		current = sorted([(f_score, link) for link in openset], reverse=True)[0][1]
		print current
		if current == goal:
			return reconstruct_path(navigated, goal)

		openset.remove(current)
		closedset.append(current)
		for neighbor in [trypage(link) for link in current.links]:
			if neighbor in closedset:
				break
			tentative_g_score = g_score(current)

			if neighbor not in openset:
				navigated[neighbor.title] = current.title
				if neighbor not in openset:
					openset.append(neighbor)

	return None

def reconstruct_path(came_from, current):
	total_path = [current]
	while current in came_from:
		current = came_from[current]
		total_path.append(current)
	return total_path

def heuristic_cost(start, goal):
	return 0

def trypage(link):
	try:
		return wikipedia.page(link)
	except wikipedia.exceptions.PageError:
		return None
	except wikipedia.exceptions.DisambiguationError:
		return None

if __name__ == '__main__':
	if len(sys.argv) > 1:
		first = wikipedia.page(sys.argv[1])
	else:
		first = wikipedia.page(wikipedia.random())
	goal = wikipedia.page('Adolf Hitler')

	AStar(first, goal)