plugin_tests/h_narwhals/test_h_narwhals.py

import json

from hamilton import base, driver
from hamilton.plugins import h_narwhals, h_polars

from .resources import narwhals_example


def test_pandas():
    # pandas
    dr = (
        driver.Builder()
        .with_config({"load": "pandas"})
        .with_modules(narwhals_example)
        .with_adapters(
            h_narwhals.NarwhalsAdapter(),
            h_narwhals.NarwhalsDataFrameResultBuilder(base.PandasDataFrameResult()),
        )
        .build()
    )
    r = dr.execute(
        [narwhals_example.group_by_mean, narwhals_example.example1], inputs={"col_name": "a"}
    )
    assert r.to_dict() == {
        "example1": {0: 3, 1: 3, 2: 3},
        "group_by_mean.a": {0: 1, 1: 2, 2: 3},
        "group_by_mean.b": {0: 4.5, 1: 6.5, 2: 8.0},
    }


def test_polars():
    # polars
    dr = (
        driver.Builder()
        .with_config({"load": "polars"})
        .with_modules(narwhals_example)
        .with_adapters(
            h_narwhals.NarwhalsAdapter(),
            h_narwhals.NarwhalsDataFrameResultBuilder(h_polars.PolarsDataFrameResult()),
        )
        .build()
    )
    r = dr.execute(
        [narwhals_example.group_by_mean, narwhals_example.example1], inputs={"col_name": "a"}
    )
    assert json.loads(r.write_json()) == [
        {"example1": 3, "group_by_mean": {"a": 1, "b": 4.5}},
        {"example1": 3, "group_by_mean": {"a": 2, "b": 6.5}},
        {"example1": 3, "group_by_mean": {"a": 3, "b": 8.0}},
    ]