Make mypy more strict

Author: dstansby

pyproject.toml

@@ -19,5 +19,24 @@ select = ["I", "UP", "F", "E", "W"]
 fix = true
 
 [tool.mypy]
+# Block below are checks that form part of mypy 'strict' mode
+warn_unused_configs = true
+warn_redundant_casts = true
+warn_unused_ignores = true
+strict_equality = true
+strict_concatenate = true
+check_untyped_defs = true
+disallow_subclassing_any = false # TODO: fix
+disallow_untyped_decorators = true
+disallow_any_generics = true
+disallow_untyped_calls = true
 disallow_incomplete_defs = true
-ignore_missing_imports = true
+disallow_untyped_defs = true
+no_implicit_reexport = true
+warn_return_any = false # TODO: fix
+
+[[tool.mypy.overrides]]
+module = [
+    "napari_matplotlib/tests/*",
+]
+disallow_untyped_defs = false

src/napari_matplotlib/base.py

@@ -125,7 +125,7 @@ def draw(self) -> None:
         This is a no-op, and is intended for derived classes to override.
         """
 
-    def apply_napari_colorscheme(self):
+    def apply_napari_colorscheme(self) -> None:
         """
         Apply napari-compatible colorscheme to the axes object.
         """
@@ -157,7 +157,7 @@ def _on_update_layers(self) -> None:
         This is a no-op, and is intended for derived classes to override.
         """
 
-    def _replace_toolbar_icons(self):
+    def _replace_toolbar_icons(self) -> None:
         # Modify toolbar icons and some tooltips
         for action in self.toolbar.actions():
             text = action.text()
@@ -179,7 +179,7 @@ def _replace_toolbar_icons(self):
 class NapariNavigationToolbar(NavigationToolbar2QT):
     """Custom Toolbar style for Napari."""
 
-    def _update_buttons_checked(self):
+    def _update_buttons_checked(self) -> None:
         """Update toggle tool icons when selected/unselected."""
         super()._update_buttons_checked()
         # changes pan/zoom icons depending on state (checked or not)

src/napari_matplotlib/slice.py

@@ -49,7 +49,7 @@ def __init__(self, napari_viewer: napari.viewer.Viewer):
         self.update_layers(None)
 
     @property
-    def layer(self):
+    def layer(self) -> napari.Layer:
         return self.layers[0]
 
     @property

src/napari_matplotlib/tests/test_scatter.py

@@ -1,3 +1,5 @@
+from typing import Any, Dict, Tuple
+
 import numpy as np
 
 from napari_matplotlib import FeaturesScatterWidget, ScatterWidget
@@ -19,7 +21,9 @@ def test_features_scatter_widget(make_napari_viewer):
     FeaturesScatterWidget(viewer)
 
 
-def make_labels_layer_with_features():
+def make_labels_layer_with_features() -> (
+    Tuple[np.ndarray, Dict[str, Tuple[Any]]]
+):
     label_image = np.zeros((100, 100), dtype=np.uint16)
     for label_value, start_index in enumerate([10, 30, 50], start=1):
         end_index = start_index + 10

src/napari_matplotlib/tests/test_util.py

@@ -12,4 +12,4 @@ def test_interval():
     assert 10 not in interval
 
     with pytest.raises(ValueError, match="must be an integer"):
-        "string" in interval
+        "string" in interval  # type: ignore

src/napari_matplotlib/util.py

@@ -19,7 +19,7 @@ def __init__(self, lower_bound: Optional[int], upper_bound: Optional[int]):
         self.lower = lower_bound
         self.upper = upper_bound
 
-    def __contains__(self, val):
+    def __contains__(self, val: int) -> bool:
         if not isinstance(val, int):
             raise ValueError("variable must be an integer")
         if self.lower is not None and val < self.lower: