refactor tile_gen in Python

scripts/tile_gen/tile_gen_lib/utils.py

@@ -0,0 +1,14 @@
+import os
+import sys
+from pathlib import Path
+
+
+def python_venv_executable() -> Path:
+    venv_path = os.environ.get('VIRTUAL_ENV')
+
+    if venv_path:
+        return Path(venv_path) / 'bin' / 'python'
+    elif sys.prefix != sys.base_prefix:
+        return Path(sys.prefix) / 'bin' / 'python'
+    else:
+        return Path(sys.executable)