enable the mypy "truthy-bool" error code

Tests/test_image.py

@@ -570,7 +570,7 @@ def test_check_size(self) -> None:
         im = Image.new("L", (100, 0))
         assert im.size == (100, 0)
 
-        assert Image.new("RGB", (1, 1))
+        assert isinstance(Image.new("RGB", (1, 1)), Image.Image)
         # Should pass lists too
         i = Image.new("RGB", [1, 1])
         assert isinstance(i.size, tuple)

Tests/test_pyarrow.py

@@ -112,8 +112,6 @@ def test_to_array(mode: str, dtype: pyarrow.DataType, mask: list[int] | None) ->
 
     reloaded = Image.fromarrow(arr, mode, img.size)
 
-    assert reloaded
-
     assert_image_equal(img, reloaded)
 
 

Tests/test_qt_image_qapplication.py

@@ -56,9 +56,8 @@ def roundtrip(expected: Image.Image) -> None:
 def test_sanity(tmp_path: Path) -> None:
     # Segfault test
     app: QApplication | None = QApplication([])
-    ex = Example()
+    ex = Example()  # noqa: F841
     assert app  # Silence warning
-    assert ex  # Silence warning
 
     for mode in ("1", "RGB", "RGBA", "L", "P"):
         # to QPixmap

checks/check_png_dos.py

@@ -28,8 +28,7 @@ def test_dos_text() -> None:
     try:
         im = Image.open(TEST_FILE)
         im.load()
-    except ValueError as msg:
-        assert msg, "Decompressed Data Too Large"
+    except ValueError:
         return
 
     assert isinstance(im, PngImagePlugin.PngImageFile)

pyproject.toml

@@ -218,7 +218,7 @@ python_version = "3.10"
 pretty = true
 disallow_any_generics = true
 disallow_untyped_defs = true
-enable_error_code = "ignore-without-code"
+enable_error_code = [ "ignore-without-code", "truthy-bool" ]
 extra_checks = true
 follow_imports = "silent"
 warn_redundant_casts = true

src/PIL/Image.py

@@ -438,33 +438,28 @@ def preinit() -> None:
         return
 
     try:
-        from . import BmpImagePlugin
+        from . import BmpImagePlugin as BmpImagePlugin
 
-        assert BmpImagePlugin
     except ImportError:
         pass
     try:
-        from . import GifImagePlugin
+        from . import GifImagePlugin as GifImagePlugin
 
-        assert GifImagePlugin
     except ImportError:
         pass
     try:
-        from . import JpegImagePlugin
+        from . import JpegImagePlugin as JpegImagePlugin
 
-        assert JpegImagePlugin
     except ImportError:
         pass
     try:
-        from . import PpmImagePlugin
+        from . import PpmImagePlugin as PpmImagePlugin
 
-        assert PpmImagePlugin
     except ImportError:
         pass
     try:
-        from . import PngImagePlugin
+        from . import PngImagePlugin as PngImagePlugin
 
-        assert PngImagePlugin
     except ImportError:
         pass
 

src/PIL/ImageFont.py

@@ -110,7 +110,7 @@ def _load_pilfont(self, filename: str) -> None:
                 except Exception:
                     pass
                 else:
-                    if image and image.mode in ("1", "L"):
+                    if image.mode in ("1", "L"):
                         break
             else:
                 if image: