diff --git a/release/datafiles/blender_icons_geom_update.py b/release/datafiles/blender_icons_geom_update.py
index afff23967eb..fb6a1d4cf84 100755
--- a/release/datafiles/blender_icons_geom_update.py
+++ b/release/datafiles/blender_icons_geom_update.py
@@ -8,13 +8,21 @@ import os
 import subprocess
 import sys
 
+from typing import (
+    Dict,
+    Generator,
+    Optional,
+    Sequence,
+    Tuple,
+)
 
-def run(cmd, *, env=None):
+
+def run(cmd: Sequence[str], *, env: Optional[Dict[str, str]] = None) -> None:
     print("   ", " ".join(cmd))
     subprocess.check_call(cmd, env=env)
 
 
-def edit_text_file(filename, marker_begin, marker_end, content):
+def edit_text_file(filename: str, marker_begin: str, marker_end: str, content: str) -> None:
     with open(filename, 'r', encoding='utf-8') as f:
         data = f.read()
     marker_begin_index = data.find(marker_begin)
@@ -53,7 +61,7 @@ icons_blend = (
 )
 
 
-def names_and_time_from_path(path):
+def names_and_time_from_path(path: str) -> Generator[Tuple[str, float], None, None]:
     for entry in os.scandir(path):
         name = entry.name
         if name.endswith(".dat"):
diff --git a/release/datafiles/blender_icons_update.py b/release/datafiles/blender_icons_update.py
index 9590544b77a..87fef1c552f 100755
--- a/release/datafiles/blender_icons_update.py
+++ b/release/datafiles/blender_icons_update.py
@@ -8,8 +8,16 @@ import os
 import subprocess
 import sys
 
+from typing import (
+    Dict,
+    List,
+    Optional,
+    Sequence,
+    Tuple,
+)
 
-def run(cmd, *, env=None):
+
+def run(cmd: Sequence[str], *, env: Optional[Dict[str, str]] = None) -> None:
     print("   ", " ".join(cmd))
     subprocess.check_call(cmd, env=env)
 
@@ -34,7 +42,7 @@ if not (inkscape_bin := os.environ.get("INKSCAPE_BIN")):
 
 blender_bin = os.environ.get("BLENDER_BIN", "blender")
 
-cmd = (
+cmd: Tuple[str, ...] = (
     inkscape_bin,
     os.path.join(BASEDIR, "blender_icons.svg"),
     "--export-width=602",
diff --git a/release/datafiles/ctodata.py b/release/datafiles/ctodata.py
index 58e09fa4a5b..43740aff894 100755
--- a/release/datafiles/ctodata.py
+++ b/release/datafiles/ctodata.py
@@ -24,17 +24,18 @@ except:
     sys.stdout.write("Unable to open input %s\n" % argv[1])
     sys.exit(1)
 
-data = fpin.read().rsplit("{")[-1].split("}")[0]
-data = data.replace(",", " ")
-data = data.split()
-data = [int(v) for v in data]
+data_as_str = fpin.read().rsplit("{")[-1].split("}")[0]
+data_as_str = data_as_str.replace(",", " ")
+data_as_list = [int(v) for v in data_as_str.split()]
+del data_as_str
 
 if strip_byte:
     # String data gets trailing byte.
-    last = data.pop()
+    last = data_as_list.pop()
     assert last == 0
 
-data = bytes(data)
+data = bytes(data_as_list)
+del data_as_list
 
 dname = filename + ".ctodata"
 
diff --git a/tools/check_source/check_mypy_config.py b/tools/check_source/check_mypy_config.py
index 5c341e70450..b6a3924a89e 100644
--- a/tools/check_source/check_mypy_config.py
+++ b/tools/check_source/check_mypy_config.py
@@ -13,6 +13,7 @@ PATHS: Tuple[Tuple[str, Tuple[Any, ...], Dict[str, str]], ...] = (
     ("build_files/cmake/", (), {'MYPYPATH': "modules"}),
     ("build_files/utils/", (), {'MYPYPATH': "modules"}),
     ("doc/manpage/blender.1.py", (), {}),
+    ("release/datafiles/", (), {}),
     ("tests/utils/", (), {}),
     ("tools/check_blender_release/", (), {}),
     ("tools/check_source/", (), {'MYPYPATH': "modules"}),
@@ -38,6 +39,7 @@ PATHS_EXCLUDE = set(
         "build_files/cmake/cmake_static_check_smatch.py",
         "build_files/cmake/cmake_static_check_sparse.py",
         "build_files/cmake/cmake_static_check_splint.py",
+        "release/datafiles/blender_icons_geom.py",  # Uses `bpy` too much.
         "tests/utils/bl_run_operators.py",  # Uses `bpy` too much.
         "tests/utils/bl_run_operators_event_simulate.py",  # Uses `bpy` too much.
         "tools/check_blender_release/check_module_enabled.py",