Graphs in Python
Practice this questionWANT TO UNDERSTAND THE CONCEPT FIRST?Learn Graphs in Python
Graph representation
graph = {
'A': ['B', 'C'],
'B': ['D'],
'C': ['E']
}Problems to practice
- Number of Islands
- Clone Graph
- Course Schedule
- Topological Sort
- BFS and DFS
- Shortest path in unweighted graph
- Union-Find problems
Example: BFS
from collections import deque
def bfs(graph, start):
visited = {start}
queue = deque([start])
while queue:
node = queue.popleft()
print(node)
for neighbor in graph.get(node, []):
if neighbor not in visited:
visited.add(neighbor)
queue.append(neighbor)Adapted from 18_DSA_PYTHON.md · “9. Graphs in Python”. Code examples are study fragments. Difficulty and core labels are editorial estimates; version-specific behavior should be checked against your project.