python实现dict版图遍历示例

class Graph():
def __init__(self, V, E):
self.V = V
self.E = E
self.visited = []
self.dict = {}
self.fd = open("input.txt")

def initGraph(self):
self.visited = [0 for i in range(self.V+1)]
for i in range(self.E):
f, t = map(int, self.fd.readline().split())
#f, t = map(int, sys.stdin.readline().split())
if self.dict.has_key(f)==False:
l = []
l.append(t)
self.dict[f] = l
else:
l = self.dict[f]
l.append(t)
self.dict[f] = l


def dfsGraph(self, src):
self.visited[src] = 1
print src ,
if self.dict.get(src): #self.dict[src]会出现异常
for u in self.dict[src]:
if self.visited[u]==0:
self.dfsGraph(u)

graph = Graph(6, 10)
graph.initGraph()
graph.dfsGraph(1)

nput.txt