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Depth-First Search (DFS) is a graph/tree traversal algorithm that explores as far as possible along each branch before backtracking. It’s useful for tasks like maze solving, cycle detection, and exploring decision trees.
Example – Recursive DFS on a Graph:
from collections import defaultdictclass Graph:def __init__(self):self.graph = defaultdict(list)def add_edge(self, u, v):self.graph[u].append(v)def dfs_util(self, v, visited):visited.add(v)print(v, end=' ')for neighbour in self.graph[v]:if neighbour not in visited:self.dfs_util(neighbour, visited)def dfs(self, start):visited = set()self.dfs_util(start, visited)# Usageg = Graph()g.add_edge(0, 1)g.add_edge(0, 2)g.add_edge(1, 2)g.add_edge(2, 0)g.add_edge(2, 3)g.add_edge(3, 3)print("DFS starting from vertex 2:")g.dfs(2)Copied!✕CopyOutput: 2 0 1 3 Here, DFS starts at 2, explores deeply before backtracking.
Iterative DFS using Stack:
Depth First Search or DFS for a Graph - Python
Jul 23, 2025 · Python Depth First Search Algorithm is used for traversing or searching tree or graph data structures. The algorithm starts at the root node …
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- Now, knowing the algorithm to apply the Depth-First Search implementation in python, we will see how the source code of the program works. Consider the following graph which is implemented in the code below: In the above code, first, we will create the graph for which we will use the depth-first search. After creation, we will create a set for stor...
Depth-First Search in Python: Traversing Graphs and Trees
Nov 3, 2024 · Depth-First Search in Python: Traversing Graphs and Trees Discover the essentials of depth-first search for navigating graphs and trees. Implement …
Depth First Search (DFS) Algorithm in Python - datagy
Jan 8, 2024 · Learn how to implement depth-first search (DFS) in Python from scratch and using the NetworkX library. DFS is a graph traversal algorithm that …
Depth-First Search (DFS) Implementation in Python
Feb 13, 2025 · In Python, implementing DFS can be used to solve a wide range of problems, such as finding paths in a maze, detecting cycles in a graph, and solving puzzles. This blog post will guide you …
Implementing Depth-First Search (DFS) Algorithm in …
Learn how to implement Depth-First Search (DFS) Algorithm in Python using both recursive and iterative approaches. Explore real-world applications, understand …
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Depth First Search (DFS) Algorithm in Python - Analytics …
Jun 5, 2024 · Learn Python's Depth First Search (DFS) algorithm: explore nodes deeply before backtracking. Understand recursive and iterative with examples.
Depth First Search (DFS) Algorithm - Programiz
Learn how to implement the depth-first search (DFS) algorithm for graphs using Python. See the pseudocode, example, and complexity of DFS.
Implement the Depth-First Search Algorithm - freeCodeCamp.org
In this lab, you will implement a graph traversal algorithm called depth-first search. Whereas the breadth-first search searches incremental edge lengths away from the source node, depth-first search first …
Depth First Search or DFS for a Graph - GeeksforGeeks
Mar 28, 2026 · Depth First Search (DFS) starts from a given source vertex and explores one path as deeply as possible. When it reaches a vertex with no …
Deep dive into Depth First Search Algorithm Python
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