diff --git a/src/forge_invar/tools/debug_img.py b/src/forge_invar/tools/debug_img.py
index 26091ee..534e97b 100644
--- a/src/forge_invar/tools/debug_img.py
+++ b/src/forge_invar/tools/debug_img.py
@@ -7,6 +7,7 @@ from ..forge_data import ForgeData
 
 log = logging.getLogger(__name__)
 
+
 def debug_image(im: Image.Image) -> None:
     im = im.resize((1280, 640)).convert("RGB")
 
diff --git a/src/forge_invar/tools/gen_img.py b/src/forge_invar/tools/gen_img.py
index 8896d95..e27487f 100644
--- a/src/forge_invar/tools/gen_img.py
+++ b/src/forge_invar/tools/gen_img.py
@@ -10,6 +10,7 @@ from ..display import BLANK_IMG, FONT_1, FONT_2
 
 log = logging.getLogger(__name__)
 
+
 def generate_loading_image() -> None:
     im = BLANK_IMG.copy()
 
diff --git a/src/forge_invar/tools/sentences.py b/src/forge_invar/tools/sentences.py
index 01d9d0b..16ee010 100644
--- a/src/forge_invar/tools/sentences.py
+++ b/src/forge_invar/tools/sentences.py
@@ -29,20 +29,23 @@ const int lengths[] = int[SENTENCE_COUNT](
 
 log = logging.getLogger(__name__)
 
+
 def read_mapping() -> dict[str, str]:
-    mapping = {' ': '0x20'}
+    mapping = {" ": "0x20"}
     with CP437_FILE.open() as cp437:
         for line in cp437:
-            if (match := re.match(r'.*// (0x\w\w), (.)$', line)):
+            if match := re.match(r".*// (0x\w\w), (.)$", line):
                 mapping[match.group(2)] = match.group(1)
     return mapping
 
+
 def read_sentences() -> list[str]:
     if SENTENCES_FILE.exists():
         return SENTENCES_FILE.read_text().splitlines()
     log.warning("sentences.txt not found, using backup")
     return BACKUP_SENTENCES_FILE.read_text().splitlines()
 
+
 def convert(sentence: str, mapping: dict[str, str], max_len: int) -> str:
     out = []
     for i in range(max_len):
@@ -55,6 +58,7 @@ def convert(sentence: str, mapping: dict[str, str], max_len: int) -> str:
             out += [mapping[sentence[i]]]
     return ", ".join(out)
 
+
 def main():
     mapping = read_mapping()
     sentences = read_sentences()
@@ -66,15 +70,17 @@ def main():
             len(sentences),
             max_len,
             "".join(
-                "    " + convert(sentence, mapping, max_len) + ("," if i < len(sentences) - 1 else " ") + f" // {sentence}\n"
+                "    "
+                + convert(sentence, mapping, max_len)
+                + ("," if i < len(sentences) - 1 else " ")
+                + f" // {sentence}\n"
                 for i, sentence in enumerate(sentences)
             ),
-            "    " + ", ".join(str(len(sentence)) for sentence in sentences) + "\n"
+            "    " + ", ".join(str(len(sentence)) for sentence in sentences) + "\n",
         )
     )
     log.info(f"Wrote {len(sentences)} sentences to {TARGET_FILE}")
 
 
-
 if __name__ == "__main__":
     main()