Implemented utility method to dynamically import class from file

Author: fjwillemsen

kernel_tuner/file_utils.py

@@ -3,6 +3,7 @@
 import json
 import subprocess
 from importlib.metadata import PackageNotFoundError, requires, version
+from importlib.util import spec_from_file_location, module_from_spec
 from pathlib import Path
 from sys import platform
 
@@ -302,3 +303,18 @@ def store_metadata_file(metadata_filename: str):
     with open(metadata_filenamepath, "w+") as fh:
         json.dump(metadata_json, fh, indent="  ")
 
+def import_class_from_file(file_path: Path, class_name):
+    """Import a class from a file."""
+    module_name = file_path.stem
+    spec = spec_from_file_location(module_name, file_path)
+    if spec is None:
+        raise ImportError(f"Could not load spec from {file_path}")
+    
+    # create a module from the spec and execute it
+    module = module_from_spec(spec)
+    spec.loader.exec_module(module)
+    if not hasattr(module, class_name):
+        raise ImportError(f"Module '{module_name}' has no class '{class_name}'")
+    
+    # return the class from the module
+    return getattr(module, class_name)