fix: Pipeline TypeError: can only concatenate list (not "NoneType") to list Using Sou (aws#5518)

Author: aviruthen

sagemaker-core/src/sagemaker/core/workflow/utilities.py

@@ -197,6 +197,8 @@ def get_processing_dependencies(dependency_args: List[List[str]]) -> List[str]:
 
 
 def get_processing_code_hash(code: str, source_dir: str, dependencies: List[str]) -> str:
+    # Defensively handle None dependencies to prevent TypeError on list concatenation
+    dependencies = dependencies or []
     """Get the hash of a processing step's code artifact(s).
 
     Args:

sagemaker-core/tests/unit/workflow/test_utilities.py

@@ -250,6 +250,35 @@ def test_get_processing_code_hash_s3_uri(self):
         assert result is None
 
     def test_get_processing_code_hash_with_dependencies(self):
+
+    def test_get_processing_code_hash_with_none_dependencies(self):
+        """Test get_processing_code_hash with None dependencies does not raise TypeError"""
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".py", delete=False) as f:
+            f.write("print('hello')")
+            temp_file = f.name
+
+        try:
+            # Should not raise TypeError when dependencies is None
+            result = get_processing_code_hash(code=temp_file, source_dir=None, dependencies=None)
+
+            assert result is not None
+            assert len(result) == 64
+        finally:
+            os.unlink(temp_file)
+
+    def test_get_processing_code_hash_with_none_dependencies_and_source_dir(self):
+        """Test get_processing_code_hash with source_dir and None dependencies"""
+        with tempfile.TemporaryDirectory() as temp_dir:
+            code_file = Path(temp_dir, "script.py")
+            code_file.write_text("print('hello')")
+
+            # Should not raise TypeError when dependencies is None
+            result = get_processing_code_hash(
+                code=str(code_file), source_dir=temp_dir, dependencies=None
+            )
+
+            assert result is not None
+            assert len(result) == 64
         """Test get_processing_code_hash with dependencies"""
         with tempfile.TemporaryDirectory() as temp_dir:
             code_file = Path(temp_dir, "script.py")
@@ -317,6 +346,35 @@ def test_get_training_code_hash_s3_uri(self):
         assert result is None
 
     def test_get_training_code_hash_pipeline_variable(self):
+
+    def test_get_training_code_hash_with_none_dependencies_source_dir(self):
+        """Test get_training_code_hash with source_dir and None dependencies does not raise"""
+        with tempfile.TemporaryDirectory() as temp_dir:
+            entry_file = Path(temp_dir, "train.py")
+            entry_file.write_text("print('training')")
+
+            result = get_training_code_hash(
+                entry_point=str(entry_file), source_dir=temp_dir, dependencies=None
+            )
+
+            assert result is not None
+            assert len(result) == 64
+
+    def test_get_training_code_hash_with_none_dependencies_entry_point_only(self):
+        """Test get_training_code_hash with entry_point only and None dependencies"""
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".py", delete=False) as f:
+            f.write("print('training')")
+            temp_file = f.name
+
+        try:
+            result = get_training_code_hash(
+                entry_point=temp_file, source_dir=None, dependencies=None
+            )
+
+            assert result is not None
+            assert len(result) == 64
+        finally:
+            os.unlink(temp_file)
         """Test get_training_code_hash with pipeline variable returns None"""
         with patch("sagemaker.core.workflow.is_pipeline_variable", return_value=True):
             result = get_training_code_hash(