Pythonパッケージ開発
James Fulton
Climate informatics researcher
次の関数を作成しているとします
def get_ends(x):
"""リストの最初と最後の要素を取得"""
return x[0], x[-1]
動作確認のためにテストします
# 関数を確認
get_ends([1,1,5,39,0])
(1, 0)
優れたパッケージはテスト数を誇ります

def get_ends(x):
"""リストの最初と最後の要素を取得"""
return x[0], x[-1]
def test_get_ends():
assert get_ends([1,5,39,0]) == (1,0)
test_get_ends()
def get_ends(x):
"""リストの最初と最後の要素を取得"""
return x[0], x[1]
def test_get_ends():
assert get_ends([1,5,39,0]) == (1,0)
test_get_ends()
AssertionError:
...
def get_ends(x):
"""リストの最初と最後の要素を取得"""
return x[0], x[-1]
def test_get_ends():
assert get_ends([1,5,39,0]) == (1,0)
assert get_ends(['n','e','r','d']) == ('n','d')
mysklearn/
|-- mysklearn <-- パッケージ
|-- tests <-- テスト用ディレクトリ
|-- setup.py
|-- LICENSE
|-- MANIFEST.in
テスト用ディレクトリ構成
mysklearn/tests/ |-- __init__.py |-- preprocessing| |-- __init__.py | |-- test_normalize.py| |-- test_standardize.py |-- regression | |-- __init__.py | |-- test_regression.py |-- test_utils.py
コード用ディレクトリ構成
mysklearn/mysklearn/ |-- __init__.py |-- preprocessing| |-- __init__.py | |-- normalize.py| |-- standardize.py |-- regression | |-- __init__.py | |-- regression.py |-- utils.py
test_normalize.py 内
from mysklearn.preprocessing.normalize import (
find_max, find_min, normalize_data
)
def test_find_max(x):
assert find_max([1,4,7,1])==7
def test_find_min(x):
assert ...
def test_normalize_data(x):
assert ...
normalize.py 内
def find_max(x):
...
return x_max
def find_min(x):
...
return x_min
def normalize_data(x):
...
return x_norm
pytest
pytest は test ディレクトリ内を探索しますtest_modulename.py のようなモジュールを探しますtest_functionname() のような関数を探しますmysklearn/ <-- ここに移動
|-- mysklearn
|-- tests
|-- setup.py
|-- LICENSE
|-- MANIFEST.in
pytest
======================== test session starts ========================
platform linux -- Python 3.7.9, pytest-6.1.2, py-1.9.0, pluggy-0.13.1
rootdir: /home/workspace/mypackages/mysklearn
collected 6 items
tests/preprocessing/test_normalize.py ... [ 50%]
tests/preprocessing/test_standardize.py ... [100%]
========================= 6 passed in 0.23s =========================
pytest
======================== test session starts ========================
platform linux -- Python 3.7.9, pytest-6.1.2, py-1.9.0, pluggy-0.13.1
rootdir: /home/workspace/mypackages/mysklearn <-- このディレクトリで実行
collected 6 items <-- テスト関数を6件検出
tests/preprocessing/test_normalize.py ... [ 50%]
tests/preprocessing/test_standardize.py ... [100%]
========================= 6 passed in 0.23s =========================
pytest
======================== test session starts ========================
platform linux -- Python 3.7.9, pytest-6.1.2, py-1.9.0, pluggy-0.13.1
rootdir: /home/workspace/mypackages/mysklearn
collected 6 items
tests/preprocessing/test_normalize.py ... [ 50%] <--
tests/preprocessing/test_standardize.py ... [100%] <--
========================= 6 passed in 0.23s =========================
pytest
======================== test session starts ========================
platform linux -- Python 3.7.9, pytest-6.1.2, py-1.9.0, pluggy-0.13.1
rootdir: /home/workspace/mypackages/mysklearn
collected 6 items
tests/preprocessing/test_normalize.py ... [ 50%]
tests/preprocessing/test_standardize.py ... [100%]
========================= 6 passed in 0.23s =========================
pytest
==================================== test session starts ====================================
...
tests/preprocessing/test_normalize.py .F. [ 50%]
tests/preprocessing/test_standardize.py ... [100%]
========================================= FAILURES ==========================================
________________________________________ test_mymax _________________________________________
...
tests/preprocessing/test_normalize.py:10: AssertionError
================================== short test summary info ==================================
FAILED tests/preprocessing/test_normalize.py::test_mymax - assert -100 == 100 <-- test_mymax
================================ 1 failed, 5 passed in 0.17s ================================
Pythonパッケージ開発