igraph

What it is and what it does

igraph is a Python binding to a high-performance C graph library designed for network research and complex network analysis. It provides data structures and algorithms for constructing graphs, computing network metrics, detecting communities, and analyzing structural properties. The package is aimed at researchers and developers working with graph-based problems in biology, physics, social networks, and discrete mathematics.

The library's core functionality is written in C for speed, but is exposed through a Python API. Graph visualization is optional and requires separate installation of Cairo bindings (cairocffi or pycairo); the description notes that cairocffi is recommended for Jupyter notebook compatibility. The package supports Python 3.9 and later, with precompiled wheels for most common platforms, reducing installation complexity compared to pure source builds.

Use it for:

• Analyze social networks, citation networks, or biological networks to compute centrality measures and detect community structure
• Perform graph algorithms like shortest paths, spanning trees, or clique detection on large datasets
• Generate publication-quality network visualizations using Cairo integration for research papers or reports
• Study discrete mathematical properties of graphs in academic research or algorithm development
• Build network-based applications requiring fast graph operations on millions of nodes or edges

Worth the install?

AI-flagged interpretation of the facts on this page — verify before relying

igraph provides a Python interface to a high-performance C graph library for constructing, analyzing, and visualizing networks and complex graphs.

Yes, if you need to work with graphs or networks. igraph is actively maintained, widely used (top 5000 on PyPI), has no known vulnerabilities, and offers substantial performance advantages over pure-Python graph libraries due to its C backend. The copyleft GPL license is a consideration if you plan to redistribute; otherwise it poses no barrier to use. Medium install friction is acceptable given the availability of prebuilt wheels.

Install

igraph on PyPI

pip install igraph

uv add igraph

poetry add igraph

Installing igraph

Before you install

Medium install friction due to compiled C bindings; however, prebuilt wheels are available for common platforms (macOS, Linux, Windows) and Python versions 3.9–3.13. The package is actively maintained with recent commits and a stable release cadence.

License in practice

Licensed under GNU General Public License (GPL), a copyleft license. Any software that links to or redistributes igraph must comply with GPL terms, including making source code available under compatible terms.

Quickstart

pip install igraph

import igraph as ig

# Create a simple graph
g = ig.Graph.Famous("petersen")
print(g.summary())

Requires Python 3.9 or later. Graph plotting requires separate installation of cairocffi or pycairo; cairocffi is recommended for Jupyter compatibility.

Verify before relying

• Whether graph plotting requires explicit installation of cairocffi or pycairo, or if igraph functions without them
• Performance characteristics and scalability limits for large graphs

Package facts

Evidence: igraph-1.0.0-cp39-abi3-macosx_10_15_x86_64.whl; igraph-1.0.0-cp39-abi3-macosx_11_0_arm64.whl; igraph-1.0.0-cp39-abi3-manylinux_2_28_aarch64.whl; igraph-1.0.0-cp39-abi3-manylinux_2_28_x86_64.whl; igraph-1.0.0-cp39-abi3-musllinux_1_2_aarch64.whl; igraph-1.0.0-cp39-abi3-musllinux_1_2_x86_64.whl; igraph-1.0.0-cp39-abi3-win32.whl; igraph-1.0.0-cp39-abi3-win_amd64.whl; igraph-1.0.0-cp39-abi3-win_arm64.whl; igraph-1.0.0-pp311-pypy311_pp73-macosx_10_15_x86_64.whl; igraph-1.0.0-pp311-pypy311_pp73-macosx_11_0_arm64.whl; igraph-1.0.0-pp311-pypy311_pp73-manylinux_2_28_aarch64.whl; igraph-1.0.0-pp311-pypy311_pp73-manylinux_2_28_x86_64.whl; igraph-1.0.0-pp311-pypy311_pp73-win_amd64.whl

Keywords: graph, network, mathematics, math, graph theory, discrete mathematics

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