fix: satisfy copilot warnings regarding py version syntax and import paths

Author: GREENRAT-K405

mkconcore.py

@@ -151,9 +151,12 @@ def _resolve_concore_path():
 _tmp_graphml_file = None  # keep reference so the temp file isn't deleted early
 if os.path.splitext(GRAPHML_FILE)[1].lower() in _IMAGE_EXTS:
     try:
-        _tool_dir = os.path.join(os.path.dirname(os.path.abspath(__file__)), "tools")
-        sys.path.insert(0, _tool_dir)
-        from extract_graphml import extract_graphml as _extract_graphml
+        import importlib.util
+        _tool_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "tools", "extract_graphml.py")
+        _spec = importlib.util.spec_from_file_location("extract_graphml", _tool_path)
+        _extract_graphml_module = importlib.util.module_from_spec(_spec)
+        _spec.loader.exec_module(_extract_graphml_module)
+        _extract_graphml = _extract_graphml_module.extract_graphml
         _graphml_str = _extract_graphml(GRAPHML_FILE)
         if _graphml_str is None:
             print(f"No embedded GraphML found in '{GRAPHML_FILE}'.")

tools/extract_graphml.py

@@ -1,3 +1,4 @@
+from typing import Optional
 import struct
 import zlib
 import sys
@@ -11,7 +12,7 @@
 _PNG_SIGNATURE = b"\x89PNG\r\n\x1a\n"
 
 
-def _extract_from_png(data: bytes) -> str | None:
+def _extract_from_png(data: bytes) -> Optional[str]:
     #Return the GraphML string embedded in a PNG file, or None
     if data[:8] != _PNG_SIGNATURE:
         return None
@@ -87,7 +88,7 @@ def _extract_from_png(data: bytes) -> str | None:
 _JPEG_SOI = b"\xff\xd8"
 
 
-def _extract_from_jpeg(data: bytes) -> str | None:
+def _extract_from_jpeg(data: bytes) -> Optional[str]:
     #Return the GraphML string embedded in a JPEG file, or None.
     if data[:2] != _JPEG_SOI:
         return None
@@ -119,7 +120,7 @@ def _extract_from_jpeg(data: bytes) -> str | None:
 # ---------------------------------------------------------------------------
 
 
-def extract_graphml(image_path: str) -> str | None:
+def extract_graphml(image_path: str) -> Optional[str]:
     try:
         with open(image_path, "rb") as fh:
             data = fh.read()
@@ -141,7 +142,7 @@ def extract_graphml(image_path: str) -> str | None:
     return None
 
 
-def extract_graphml_to_file(image_path: str, output_path: str | None = None) -> str | None:
+def extract_graphml_to_file(image_path: str, output_path: Optional[str] = None) -> Optional[str]:
     graphml = extract_graphml(image_path)
     if graphml is None:
         print(