Add Mypy type checking infrastructure (#5127)

* Add minimal mypy configuration file.

* Add mypy workflow to GH.

* Properly import sentinels from traversal.edgedfs.

* mypy doesn't like variables named \"e\".

* Rm annotations from single function.

* Fix name collisions in test suite.

Make sure all tests have unique names.

* Rm unused random seed in test setup.

* Rm redundant __all__ specification.

* Silence mypy error from sum(). Mypy bug?

* Fix tsp test instantiation nit.

* \"type: ignore\" to suppress conditional fn sigature errors.

* Remaining \"type: ignore\" to appease mypy.

* Configure mypy to ignore inheritance issues.

* Update exclude conf for CI.

 - Add yaml
 - Reformat regex containing reportviews

* Rm partial annotations from lukes.py.

Fixes mypy errors due to unannotated code.

* Reorg defaultdict to reduce type: ignore cruft.

* Homogenize signatures for fns defined in conditionals.

* err as varname only in exception catching.

* Fix name collision in Bellman-Ford test suite.

1 files changed, 30 insertions, 0 deletions

diff --git a/.github/workflows/mypy.yml b/.github/workflows/mypy.yml
new file mode 100644
index 00000000..4fb47ba8
--- /dev/null
+++ b/.github/workflows/mypy.yml
@@ -0,0 +1,30 @@
+name: Mypy
+
+on: [push, pull_request]
+
+jobs:
+  type-check:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.9]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install packages
+        run: |
+          pip install --upgrade pip wheel setuptools
+          pip install -r requirements/developer.txt
+          # Rm below when yaml no longer a dep
+          pip install types-PyYAML
+          pip install -e .
+          pip list
+
+      - name: run mypy
+        run: mypy -p networkx