Sunday, 16 March 2025

Python Coding challenge - Day 406| What is the output of the following Python Code?

 



Code Explanation:

Importing NetworkX
import networkx as nx  
Imports the networkx library, which is used for graph creation and analysis in Python.

Creating a Directed Graph
G = nx.DiGraph([(1, 2), (2, 3), (3, 1), (3, 4)])  


Creates a directed graph (DiGraph).
Adds four directed edges:
1 → 2
2 → 3
3 → 1
3 → 4

Graph Representation:
   1 → 2  
   ↑    ↓  
   3 ←  4  

Finding Predecessors of Node 3
pred = list(G.predecessors(3))  
Finds all nodes that have an edge pointing to 3 (predecessors).
In the graph:
2 → 3 (So 2 is a predecessor)
1 → 3 (So 1 is a predecessor)

Output:
[2, 1]

Finding Successors of Node 3
succ = list(G.successors(3))  

Finds all nodes where 3 points to (successors).
In the graph:
3 → 1
3 → 4

Output:
[4]

Printing Predecessors and Successors
print(pred, succ)  

Prints the predecessors and successors of node 3.


Final Output:

[2] [1,4]
[][2] [1, 4][2] [1, 4]


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