first

README.md

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+# INCREMENT
+it adds one.

increment/__init__.py

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+from .core import add_one
+
+__all__ = ["add_one"]

increment/core.py

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+def add_one(number):
+    return number + 1

pyproject.toml

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+[build-system]
+requires = ["setuptools>=61.0"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "increment"
+version = "0.1"
+description = "it adds one"
+readme = "README.md"
+requires-python = ">=3.7"
+license = "MIT"
+authors = [
+    { name = "Ondrej Hladuvka", email = "mail@hladu.xyz" }
+]
+classifiers = [
+    "Programming Language :: Python :: 3",
+    "Operating System :: OS Independent"
+]
+
+[project.urls]
+Homepage = "https://git.hladu.xyz/increment"
+
+[tool.setuptools]
+packages = ["increment"]

tests/test.py

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+import unittest
+from increment import add_one
+
+class Tester(unittest.TestCase):
+    def test_add_one(self):
+        self.assertEqual(add_one(1),  2)
+        self.assertEqual(add_one(-1), 0)
+        self.assertEqual(add_one(0),  1)
+
+if __name__ == "__main__":
+    unittest.main()