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A Python implementation of Google's Encoded Polyline Algorithm Format.

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polyline is a Python implementation of Google’s Encoded Polyline Algorithm Format. It is essentially a port of Mapbox polyline with some additional features.


polyline can be installed using pip:

$ pip install polyline

Starting from v2.0.0 only Python 3.7 and above is supported. For Python 2 support, please install v1.4.0:

$ pip install polyline==1.4.0

API Documentation


To get the encoded polyline representation of a given set of (lat, lon) coordinates:

import polyline
polyline.encode([(38.5, -120.2), (40.7, -120.9), (43.2, -126.4)], 5)

This should return _p~iF~ps|U_ulL~ugC_hgN~eq`@.

You can set the required precision with the optional precision parameter. The default value is 5.

You can encode (lon, lat) tuples by setting geojson=True.


To get a set of coordinates represented by a given encoded polyline string:

import polyline
polyline.decode('u{~vFvyys@fS]', 5)

This should return [(40.63179, -8.65708), (40.62855, -8.65693)] in (lat, lon) order.

You can set the required precision with the optional precision parameter. The default value is 5.

You can decode into (lon, lat) tuples by setting geojson=True.


All installation and development dependencies are fully specified in pyproject.toml. The project.optional-dependencies object is used to specify optional requirements for various development tasks. This makes it possible to specify additional options when performing installation using pip:

python -m pip install .[dev]


The documentation can be generated automatically from the source files using Sphinx:

python -m -b html docs docs/_build/html

Testing and Conventions

All unit tests are executed and their coverage is measured when using pytest:

python -m pytest

Style conventions are enforced using Pylint:

python -m pylint polyline


In order to contribute to the source code, open an issue or submit a pull request on the GitHub page for this library.


Beginning with version 0.1.0, the version number format for this library and the changes to the library associated with version number increments conform with Semantic Versioning 2.0.0.


This library can be published as a package on PyPI by a package maintainer. Ensure that the correct version number appears in pyproject.toml, and that any links in this README document to the Read the Docs documentation of this package (or its dependencies) have appropriate version numbers. Also ensure that the Read the Docs project for this library has an automation rule that activates and sets as the default all tagged versions. Create and push a tag for this version (replacing ?.?.? with the version number):

git tag ?.?.?
git push origin ?.?.?

Remove any old build/distribution files. Then, package the source into a distribution archive:

rm -rf build dist src/*.egg-info
python -m build --sdist --wheel .

Finally, upload the package distribution archive to PyPI:

python -m twine upload dist/*

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