<｜begin▁of▁sentence｜>### Instruction:
Given a path graph with 4 nodes, can you show the predecessors for each node starting from the source node 0 using NetworkX, and also provide the number of hops needed to reach each node?
### Response:
import networkx as nx

# Create a path graph
G = nx.path_graph(4)

# Get predecessors of all nodes starting from the source node 0
pred = nx.predecessor(G, 0)

# Get predecessors and levels (seen) of all nodes starting from source node 0
pred, seen = nx.predecessor(G, 0, return_seen=True)

print(pred)
print(seen)
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