Add pytype linting to CI (#651)

Author: lgeiger

.github/workflows/lint.yml

@@ -18,7 +18,7 @@ jobs:
           python-version: 3.8
       - name: Install Lint Dependencies
         run: |
-          pip install pyflakes==2.3.0 black==20.8b1 --no-cache-dir
+          pip install pyflakes==2.3.0 black==20.8b1 pytype==2021.5.25 --no-cache-dir
           sudo wget -O /usr/local/bin/buildifier https://github.com/bazelbuild/buildtools/releases/download/4.0.1/buildifier-linux-amd64
           sudo chmod +x /usr/local/bin/buildifier
       - name: Run PyFlakes
@@ -31,3 +31,5 @@ jobs:
           clangFormatVersion: 12
       - name: Lint bazel files
         run: buildifier -mode=check -r ./
+      - name: Type check with PyType
+        run: pytype --jobs auto

.gitignore

@@ -1,3 +1,4 @@
+.pytype
 .lce_configure.bazelrc
 .DS_Store
 .ipynb_checkpoints

setup.cfg

@@ -0,0 +1,10 @@
+[pytype]
+
+inputs = larq_compute_engine
+# Keep going past errors to analyse as many files as possible.
+keep_going = True
+# Don't check use of imported modules, because we have no type-stubs for TF.
+strict_import = True
+# Disable import errors since our pybind modules are not available during type check and we don't supply type stubs
+disable = import-error
+python_version = 3.8