osrm-bindings

Python bindings for osrm-backend using nanobind.

PyPI

pip install osrm-bindings

From Source

osrm-bindings requires CPython 3.10+ and can be installed from source (e.g. from an sdist on PyPI) by running the following command in the repository root:

pip install .

The Python bindings are built alongside the OSRM C++ libraries. The version of the bindings matches the version of osrm-backend.

System dependencies

A source/sdist build compiles the full OSRM C++ library, so the usual C++ toolchain (CMake ≥ 3.18, a C++20 compiler, Git) plus OSRM's native dependencies must be available. Also a development Python installation has to be in the PATH.

Debian / Ubuntu

sudo apt-get install -y \
    cmake g++ git pkg-config \
    libboost-all-dev libbz2-dev liblua5.4-dev \
    libtbb-dev libxml2-dev libzip-dev

Fedora / RHEL / Rocky / AlmaLinux

sudo dnf install -y \
    cmake gcc-c++ git pkgconf-pkg-config \
    boost-devel bzip2-devel lua-devel \
    tbb-devel libxml2-devel libzip-devel

macOS (Homebrew)

brew install cmake lua tbb boost@1.90
brew link boost@1.90

Windows (vcpkg + MSVC)

Windows builds use vcpkg to provide OSRM's C++ dependencies and require a recent MSVC toolset (Visual Studio 2022 or later).

Example steps (PowerShell / Developer Command Prompt):

# Clone & bootstrap vcpkg
git clone https://github.com/microsoft/vcpkg.git C:\vcpkg
cd C:\vcpkg
.\bootstrap-vcpkg.bat

cmake --preset release
cmake --build buildß

If installing from a pip sdist, ensure CMake is configured to use the same vcpkg toolchain file (pass the toolchain via CMake args when building the wheel or use the same environment when running pip install).

Example

The following example will showcase the process of calculating routes between two coordinates.

First, import the osrm library, and instantiate an instance of OSRM:

import osrm

# Instantiate osrm_py instance
osrm_py = osrm.OSRM("./test/data/ch/monaco.osrm")

Then, declare RouteParameters, and then pass it into the osrm_py instance:

# Declare Route Parameters
route_params = osrm.RouteParameters(
    coordinates = [(7.41337, 43.72956), (7.41546, 43.73077)]
)

# Pass it into the osrm_py instance
res = osrm_py.Route(route_params)

# Print out result output
print(res["waypoints"])
print(res["routes"])

Type Stubs

The file src/python/osrm/osrm_ext.pyi contains auto-generated type stubs for the C++ extension module. These are used by IDEs for autocompletion and by documentation tools without compiling the extension.

After changing C++ bindings, rebuild the project to regenerate the stubs:

pip install -e .

Then commit the updated .pyi file.