diff --git a/keras/src/backend/common/variables.py b/keras/src/backend/common/variables.py
index 33a2cc3c5160..e7b73a887a5c 100644
--- a/keras/src/backend/common/variables.py
+++ b/keras/src/backend/common/variables.py
@@ -573,15 +573,21 @@ def initialize_all_variables():
 def standardize_dtype(dtype):
     if dtype is None:
         return config.floatx()
+
+    orig_dtype = dtype
     dtype = dtypes.PYTHON_DTYPES_MAP.get(dtype, dtype)
     if hasattr(dtype, "name"):
         dtype = dtype.name
     elif hasattr(dtype, "__name__"):
         dtype = dtype.__name__
-    elif hasattr(dtype, "__str__") and (
-        "torch" in str(dtype) or "jax.numpy" in str(dtype)
-    ):
-        dtype = str(dtype).split(".")[-1]
+    else:
+        # Only call str(dtype) once if needed
+        dtype_str = None
+        if hasattr(dtype, "__str__"):
+            dtype_str = str(dtype)
+            # Only check and parse if the str contains what we expect
+            if "torch" in dtype_str or "jax.numpy" in dtype_str:
+                dtype = dtype_str.split(".")[-1]
 
     if dtype not in dtypes.ALLOWED_DTYPES:
         raise ValueError(f"Invalid dtype: {dtype}")
diff --git a/keras/src/dtype_policies/__init__.py b/keras/src/dtype_policies/__init__.py
index 6bf0eb45bbb7..161a25edd92b 100644
--- a/keras/src/dtype_policies/__init__.py
+++ b/keras/src/dtype_policies/__init__.py
@@ -1,7 +1,7 @@
 from keras.src import backend
 from keras.src.api_export import keras_export
 from keras.src.dtype_policies import dtype_policy
-from keras.src.dtype_policies.dtype_policy import QUANTIZATION_MODES
+from keras.src.dtype_policies.dtype_policy import _get_quantized_dtype_policy_by_str, QUANTIZATION_MODES
 from keras.src.dtype_policies.dtype_policy import DTypePolicy
 from keras.src.dtype_policies.dtype_policy import FloatDTypePolicy
 from keras.src.dtype_policies.dtype_policy import GPTQDTypePolicy
@@ -85,9 +85,6 @@ def get(identifier):
     Returns:
         A Keras `DTypePolicy` instance.
     """
-    from keras.src.dtype_policies.dtype_policy import (
-        _get_quantized_dtype_policy_by_str,
-    )
 
     if identifier is None:
         return dtype_policy.dtype_policy()
@@ -102,7 +99,7 @@ def get(identifier):
             return DTypePolicy(identifier)
     try:
         return DTypePolicy(backend.standardize_dtype(identifier))
-    except:
+    except Exception:
         raise ValueError(
             "Cannot interpret `dtype` argument. Expected a string "
             f"or an instance of DTypePolicy. Received: dtype={identifier}"