qgis-project 0.0.3

Create QGIS projects programmatically using Python

qgis-project

Create QGIS projects programmatically using Python.

from qgis_project import Project, RasterLayer, RasterStyleBW

proj = Project()
proj.add_layer("dem.tif")                                    # raster, auto-detected
proj.add_layer("boundaries.geojson")                         # vector, auto-detected
proj.add_layer(RasterLayer("dem.tif", style=RasterStyleBW(vmin=0, vmax=3000)))
proj.save("output.qgz")
proj.open()     # launch QGIS for visual inspection

Installation

Install the package:

pip install qgis-project

QGIS is not on PyPI and must be available separately. The recommended approach is a dedicated conda environment:

conda env create -f environment_platform_independent.yml
conda activate qgis-env-pi
pip install qgis-project

Or install QGIS from conda-forge into an existing environment:

conda install -c conda-forge qgis
pip install qgis-project

Note: All QGIS imports are lazy — import qgis_project works without QGIS installed. Errors only surface when a QGIS-backed method is actually called.

Usage

Basic project

from qgis_project import Project

proj = Project()
proj.add_layer("dem.tif")
proj.add_layer("roads.geojson")
proj.save("my_project.qgz")
proj.exit()

Layer groups

proj.add_layer(RasterLayer("dem.tif", group="terrain"))
proj.add_layer(RasterLayer("slope.tif", group=["terrain", "derived"]))

Raster styling

from qgis_project import RasterLayer, RasterStyleBW

layer = RasterLayer(
    file="dem.tif",
    name="Elevation",
    group="terrain",
    style=RasterStyleBW(vmin=0, vmax=3000),
)
proj.add_layer(layer)

Open in QGIS

proj.open("output.qgz")      # saves and launches QGIS
proj.print_layer_tree()      # inspect the layer tree in the terminal

Development

Install with dev dependencies:

pip install -e ".[dev]"

Run unit tests (no QGIS required):

pytest -m "not qgis"

Run integration tests (QGIS environment required):

pytest -m qgis

Run the manual visual test:

python scripts/manual_test.py