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Schema validation for Xarray
Install xarray-schema from PyPI:
pip install xarray-schema
Conda:
conda install -c conda-forge xarray-schema
Or install it from source:
pip install git+https://github.com/carbonplan/xarray-schema
Xarray-schema's API is modeled after Pandera. The DataArraySchema
and DatasetSchema
objects both have .validate()
methods.
The basic usage is as follows:
import numpy as np
import xarray as xr
from xarray_schema import DataArraySchema, DatasetSchema, CoordsSchema
da = xr.DataArray(np.ones(4, dtype='i4'), dims=['x'], name='foo')
schema = DataArraySchema(dtype=np.integer, name='foo', shape=(4, ), dims=['x'])
schema.validate(da)
You can also use it to validate a Dataset
like so:
schema_ds = DatasetSchema({'foo': schema})
schema_ds.validate(da.to_dataset())
Each component of the Xarray data model is implemented as a stand alone class:
from xarray_schema.components import (
DTypeSchema,
DimsSchema,
ShapeSchema,
NameSchema,
ChunksSchema,
ArrayTypeSchema,
AttrSchema,
AttrsSchema
)
# example constructions
dtype_schema = DTypeSchema('i4')
dims_schema = DimsSchema(('x', 'y', None)) # None is used as a wildcard
shape_schema = ShapeSchema((5, 10, None)) # None is used as a wildcard
name_schema = NameSchema('foo')
chunk_schema = ChunkSchema({'x': None, 'y': -1}) # None is used as a wildcard, -1 is used as
ArrayTypeSchema = ArrayTypeSchema(np.ndarray)
# Example usage
dtype_schama.validate(da.dtype)
# Each object schema can be exported to JSON format
dtype_json = dtype_schama.to_json()
This is a very early prototype of a library. Some key things are missing:
coords
and attrs
. These are not implemented yet.SchemaErrors
when the are found.All the code in this repository is MIT licensed, but we request that you please provide attribution if reusing any of our digital content (graphics, logo, articles, etc.).
CarbonPlan is a non-profit organization that uses data and science for climate action. We aim to improve the transparency and scientific integrity of climate solutions through open data and tools. Find out more at carbonplan.org or get in touch by opening an issue or sending us an email.
FAQs
Schema validation for Xarray objects
We found that xarray-schema demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
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