initial setup

.gitignore

+# local venvs from tox
+.tox
+
+# created during packaging
+workship_demo.egg-info
+
+# virtual environments
+venv*
+
+# vim backup files
+**/.*.sw?
+
+# byte compiled files
+**/*.pyc
+**/__pycache__

.gitlab-ci.yml

+image: python:3.7-stretch
+
+stages:
+    - style
+    - tests
+
+before_script:
+    - pip install -U pip setuptools
+    - pip install tox
+
+tests:
+    script:
+        - tox -r -vv -e py37
+    stage: tests
+
+style:
+    script:
+        - tox -r -vv -e flake8
+    allow_failure: true
+    stage: style

requirements_dev.txt

+pytest
+tox
+flake8

setup.cfg

+[flake8]
+max-line-length = 88
+select = C,E,F,W,B,B950
+ignore = E501,W503,E203

setup.py

+#! /usr/bin/env python
+# Copyright © 2019 Uwe Schitt <uwe.schmitt@id.ethz.ch>
+
+
+from setuptools import setup
+
+setup(
+    name="workship_demo",
+    version="0.1",
+    description="this is a demo for python packaging and ci testing",
+    author="Uwe Schmitt",
+    author_email="uwe.schmitt@id.ethz.ch",
+    license="MIT",
+    packages=["workship_demo"],
+    zip_safe=False,
+)

tests/test_compute.py

+#! /usr/bin/env python
+# encoding: utf-8
+
+# Copyright © 2019 Uwe Schitt <uwe.schmitt@id.ethz.ch>
+
+from workship_demo.compute import add
+
+
+def test_add():
+    assert add(1, 1) == 2
+    assert add(-1, 1) == 0
+    assert add("a", "b") == "ab"

tox.ini

+[tox]
+envlist = py27, py37, flake8
+
+[testenv]
+commands = py.test tests/
+deps = pytest
+
+[testenv:flake8]
+commands = flake8 workship_demo tests
+deps = flake8
+skip_install = True
+skipsdist = True
+

workship_demo/__main__.py

+#! /usr/bin/env python
+# Copyright © 2019 Uwe Schitt <uwe.schmitt@id.ethz.ch>
+
+import sys
+
+from .compute import add
+
+
+if __name__ == "__main__":
+    assert len(sys.argv) == 3, "need two arguments"
+    arg_0, arg_1 = sys.argv[1:]
+    result = add(arg_0, arg_1)
+    print("{} + {} = {}".format(arg_0, arg_1, result))

workship_demo/compute.py

+#! /usr/bin/env python
+# Copyright © 2019 Uwe Schitt <uwe.schmitt@id.ethz.ch>
+
+
+def add(x, y):
+    return x + y