conftest.py

import pytest
import functools
import matplotlib
import numpy as np
import pandas as pd
from sklearn import datasets


@pytest.fixture(autouse=True)
def disable_plot(monkeypatch):
    # Patch plt.show to not halt testing flow, by making it not block
    # function execution.
    # patch = functools.partial(matplotlib.pyplot.show, block=False)
    def patch(): pass
    monkeypatch.setattr(matplotlib.pyplot, "show", patch)


@pytest.fixture
def iris_df():
    # Use iris dataset as example when needed.
    # Add one made-up categorical column to create a nom-nom relationship.

    iris = datasets.load_iris()

    target = ['C{}'.format(i) for i in iris.target]

    rng = np.random.default_rng(2207)
    extra = rng.choice(list('ABCDE'), size = len(target))

    extra = pd.DataFrame(data=extra, columns=['extra'])

    X = pd.DataFrame(data=iris.data, columns=iris.feature_names)
    y = pd.DataFrame(data=target, columns=['target'])

    df = pd.concat([X, extra, y], axis=1)

    return df


@pytest.fixture(autouse=True)
def add_iris(doctest_namespace, iris_df):
    # Add iris dataset to namespace
    # This fixture is provided with autouse so that
    # the doctests can use it
    doctest_namespace['iris_df'] = iris_df