用python写出networkx中dijkstra_path的函数
时间: 2024-05-02 10:18:27 浏览: 9
以下是使用Python编写的NetworkX中的dijkstra_path函数:
```python
import networkx as nx
def dijkstra_path(G, source, target, weight='weight'):
dist = {}
prev = {}
Q = set()
for v in G.nodes():
dist[v] = float('inf')
prev[v] = None
Q.add(v)
dist[source] = 0
while len(Q) > 0:
u = None
for v in Q:
if u is None or dist[v] < dist[u]:
u = v
if u == target:
break
Q.remove(u)
for neighbor in G.neighbors(u):
alt = dist[u] + G[u][neighbor].get(weight, 1)
if alt < dist[neighbor]:
dist[neighbor] = alt
prev[neighbor] = u
path = []
u = target
while prev[u] is not None:
path.append(u)
u = prev[u]
path.append(u)
path.reverse()
return path
```
该函数接受三个参数:
- G:一个NetworkX图对象。
- source:源节点。
- target:目标节点。
- weight(可选):权重属性的名称,如果没有指定,则默认为'weight'。
该函数使用Dijkstra算法计算从源节点到目标节点的最短路径,并返回路径的节点列表。如果不存在从源节点到目标节点的路径,则返回空列表。