Add core and dev directories

.github/CODEOWNERS

@@ -18,3 +18,6 @@
 
 /.github/CODEOWNERS           @borda
 /setup.py                     @borda
+
+/src/lightning_utilities/core @borda @carmocca
+/tests/unittests/core         @borda @carmocca

.github/workflows/ci-testing.yml

@@ -30,7 +30,7 @@ jobs:
       if: matrix.requires == 'oldest'
       run: |
         pip install -e .
-        python -m lightning_utilities requirements set-oldest
+        python -m lightning_utilities.dev requirements set-oldest
 
     - uses: ./.github/actions/cache
       with:

README.md

@@ -79,7 +79,7 @@ pip install lightning_utilities
 __Usage:__
 
 ```bash
-python -m lightning_utilities [group] [command]
+python -m lightning_utilities.dev [group] [command]
 ```
 
 <details>
@@ -92,7 +92,7 @@ codecov>=2.1
 pytest>=6.0
 pytest-cov
 pytest-timeout
-$ python -m lightning_utilities requirements set-oldest
+$ python -m lightning_utilities.dev requirements set-oldest
 $ cat requirements/test.txt
 coverage==5.0
 codecov==2.1

setup.py

@@ -39,7 +39,7 @@ def _load_py_module(fname, pkg="lightning_utilities"):
     long_description_content_type="text/markdown",
     include_package_data=True,
     zip_safe=False,
-    keywords=["DevOps", "CI/CD"],
+    keywords=["Utilities", "DevOps", "CI/CD"],
     python_requires=">=3.7",
     setup_requires=[],
     install_requires=requirements,

src/lightning_utilities/__main__.py → src/lightning_utilities/dev/__main__.py

@@ -1,6 +1,6 @@
 import fire
 
-from lightning_utilities.dependencies import prune_pkgs_in_requirements, replace_oldest_ver
+from lightning_utilities.dev.dependencies import prune_pkgs_in_requirements, replace_oldest_ver
 
 
 def main() -> None:

tests/unittests/test_imports.py → tests/unittests/core/test_imports.py

@@ -1,6 +1,6 @@
 import operator
 
-from lightning_utilities.imports import compare_version, module_available, RequirementCache
+from lightning_utilities.core.imports import compare_version, module_available, RequirementCache
 
 
 def test_module_exists():

tests/unittests/test_dependencies.py → tests/unittests/dev/test_dependencies.py

@@ -1,6 +1,6 @@
 from pathlib import Path
 
-from lightning_utilities.dependencies import prune_pkgs_in_requirements, replace_oldest_ver
+from lightning_utilities.dev.dependencies import prune_pkgs_in_requirements, replace_oldest_ver
 
 _PATH_ROOT = Path(__file__).parent.parent.parent