diff --git a/api/onnx_web/convert/__main__.py b/api/onnx_web/convert/__main__.py
index ad89ead7..98cc3b7a 100644
--- a/api/onnx_web/convert/__main__.py
+++ b/api/onnx_web/convert/__main__.py
@@ -157,8 +157,6 @@ def fetch_model(
         _filename, ext = path.splitext(ext)
         if ext is not None:
             cache_name = cache_name + ext
-        else:
-            cache_name = cache_name
     else:
         cache_name = f"{cache_name}.{format}"
 
diff --git a/api/onnx_web/onnx/onnx_net.py b/api/onnx_web/onnx/onnx_net.py
index a974aff4..036c5d0d 100644
--- a/api/onnx_web/onnx/onnx_net.py
+++ b/api/onnx_web/onnx/onnx_net.py
@@ -66,8 +66,8 @@ class OnnxNet:
     def half(self):
         return self
 
-    def load_state_dict(self, net, strict=True) -> None:
+    def load_state_dict(self, _net, strict=True) -> None:
         pass
 
-    def to(self, device):
+    def to(self, _device):
         return self
diff --git a/api/onnx_web/server/static.py b/api/onnx_web/server/static.py
index 9a67bf0e..72d46dc9 100644
--- a/api/onnx_web/server/static.py
+++ b/api/onnx_web/server/static.py
@@ -27,7 +27,7 @@ def output(context: ServerContext, filename: str):
 
 
 def register_static_routes(
-    app: Flask, context: ServerContext, pool: DevicePoolExecutor
+    app: Flask, context: ServerContext, _pool: DevicePoolExecutor
 ):
     return [
         app.route("/")(wrap_route(index, context)),
diff --git a/api/onnx_web/utils.py b/api/onnx_web/utils.py
index 4755c0ee..c0ae4c00 100644
--- a/api/onnx_web/utils.py
+++ b/api/onnx_web/utils.py
@@ -121,7 +121,7 @@ def merge(a, b, path=None):
             elif a[key] == b[key]:
                 pass  # same leaf value
             else:
-                raise Exception("Conflict at %s" % ".".join(path + [str(key)]))
+                raise ValueError("conflict at %s" % ".".join(path + [str(key)]))
         else:
             a[key] = b[key]
     return a
diff --git a/api/scripts/test-release.py b/api/scripts/test-release.py
index 894dbd61..c6573ebf 100644
--- a/api/scripts/test-release.py
+++ b/api/scripts/test-release.py
@@ -341,7 +341,7 @@ def main():
             else:
                 logger.warning("test failed: %s", test.name)
                 failed.append(test.name)
-        except Exception as e:
+        except Exception:
             logger.exception("error running test for %s", test.name)
             failed.append(test.name)