pyroutingkit
Python bindings for RoutingKit Customizable Contraction Hierarchies (CCH).
Provides microsecond-scale shortest-path queries on large road networks (millions of nodes). Pre-compiled wheels for Linux (manylinux) and macOS — no C++ toolchain needed at install time.
Install
pip install pyroutingkit
Usage
import numpy as np
from pyroutingkit import CCH, INF_WEIGHT
# Build topology (one-time, expensive — can be saved/loaded)
cch = CCH()
tail = np.array([0, 1, 2], dtype=np.uint32)
head = np.array([1, 2, 0], dtype=np.uint32)
lat = np.array([9.0, 9.5, 9.2], dtype=np.float32)
lon = np.array([38.7, 39.0, 38.5], dtype=np.float32)
cch.build_topology(tail, head, lat, lon, node_count=3)
# Customize with weights (fast, can be called multiple times)
weights = np.array([100, 150, 120], dtype=np.uint32)
cch.customize_weights(weights)
# Query (microseconds)
distance, path = cch.query(0, 2)
print(f"Distance: {distance}, Path: {path}")
# Many-to-many matrix
sources = np.array([0, 1], dtype=np.uint32)
targets = np.array([1, 2], dtype=np.uint32)
matrix = cch.distances_many_to_many(sources, targets)
# Save/load topology (skip expensive build on next run)
cch.save_topology("/tmp/cch_cache")
cch2 = CCH()
cch2.load_topology("/tmp/cch_cache")
cch2.customize_weights(weights) # Must re-customize after load
API
CCH class
| Method | Description |
|---|---|
build_topology(tail, head, lat, lon, node_count) |
Build CCH from graph arrays. Uses inertial flow for node ordering. |
customize_weights(weights) |
Set edge weights (uint32). Can be called multiple times. |
query(source, target) |
Point-to-point query. Returns (distance, path). |
distances_many_to_many(sources, targets) |
NxM distance matrix. |
save_topology(dir_path) |
Save topology to disk (binary format). |
load_topology(dir_path) |
Load topology from disk (skips build). |
Properties
| Property | Type | Description |
|---|---|---|
node_count |
int |
Number of nodes |
arc_count |
int |
Number of directed edges |
is_built |
bool |
Topology has been built or loaded |
is_customized |
bool |
Weights have been set |
Constants
| Constant | Description |
|---|---|
INF_WEIGHT |
Sentinel value for unreachable pairs |
Building from source
Requires CMake 3.20+ and a C++17 compiler.
git clone --recurse-submodules https://github.com/nullbutt/pyroutingkit
cd pyroutingkit
uv build
License
MIT. RoutingKit is also MIT-licensed.
1 maintainer
Metadata
1 maintainer
Release files for pyroutingkit 0.2.1
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