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A graph in mathematics and computer science consists of “nodes” which may or may not be connected with one another. Connections between nodes are called edges. A graph can be directed (arrows) or undirected. The edges could represent distance or weight.
default graph (left), directed graph (right)
Python does not have a graph data type. To use graphs we can either use a module or implement it ourselves:
- implement graphs ourselves
- networkx module
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Graph in Python
A directed graph can be defined as:
Graphs using networkx
The networkx software module has support for creating, manipulating graphs.
Nodes: [‘A’, ‘C’, ‘B’]
Edges: [(‘A’, ‘C’), (‘A’, ‘B’), (‘C’, ‘B’)]