allowing garbage collection

docker-qgis/process_projectfile.py

@@ -8,8 +8,6 @@
 from qgis.PyQt.QtGui import QColor
 
 logger = logging.getLogger("PROCPRJ")
-# Non-blocking, streaming XML parser
-parser = ElementTree.XMLPullParser(["start", "end"])
 
 
 class ProjectFileNotFoundException(BaseException):
@@ -45,13 +43,16 @@ def check_valid_project_file(project_filename: Path) -> None:
         raise ProjectFileNotFoundException(project_filename=project_filename)
 
     if project_filename.suffix == ".qgs":
+        # Non-blocking, streaming XML parser
+        parser = ElementTree.XMLPullParser(["start", "end"])
+
         with open(project_filename, "rb") as f:
             parser.feed(f.read())
+
         last_visited_node_tag = ""
         try:
             for event, node in parser.read_events():
-                # traverse the stream in a non-blocking way, raising on the first
-                # parse error found
+                # traverse the stream, raising on the first parse error found
                 last_visited_node_tag = node.tag
         except ElementTree.ParseError as err:
             raise InvalidXmlFileException(