diff --git a/python/extractor/semmle/python/parser/tsg_parser.py b/python/extractor/semmle/python/parser/tsg_parser.py
index 1f77b648b2fa..fe9d2224cada 100644
--- a/python/extractor/semmle/python/parser/tsg_parser.py
+++ b/python/extractor/semmle/python/parser/tsg_parser.py
@@ -147,6 +147,9 @@ def _decode_tsg_node_attributes(encoded_attrs, path, logger):
         )
     return attrs
 
+def _format_node_attributes(attrs):
+    return repr(dict(sorted(attrs.items())))
+
 def read_tsg_python_output(path, logger):
     command_args = tsg_command + [path]
     p = subprocess.Popen(command_args, stdout=subprocess.PIPE)
@@ -203,7 +206,11 @@ def get_context(id, node_attr, path, logger):
 
     while "ctx" not in node_attr[id]:
         if "_inherited_ctx" not in node_attr[id]:
-            logger.error("No context for node {} in file {} with attributes {}\n".format(id, path, node_attr[id]))
+            logger.error(
+                "No context for node {} in file {} with attributes {}\n".format(
+                    id, path, _format_node_attributes(node_attr[id])
+                )
+            )
             # A missing context is most likely to be a "load", so return that.
             return ast.Load()
         id = node_attr[id]["_inherited_ctx"].id
@@ -315,7 +322,11 @@ def parse(path, logger):
             nodes[id] = attrs["_is_literal"]
             continue
         if "_kind" not in attrs:
-            logger.error("Error: Graph node {} with attributes {} has no `_kind`!\n".format(id, attrs))
+            logger.error(
+                "Error: Graph node {} with attributes {} has no `_kind`!\n".format(
+                    id, _format_node_attributes(attrs)
+                )
+            )
             continue
         # This is not the node we are looking for (so don't bother creating it).
         if "_skip_to" in attrs:
@@ -353,7 +364,7 @@ def parse(path, logger):
             if field.startswith("_"): continue
             if field == "ctx": continue
             if field != "parenthesised" and field not in expected_fields:
-                logger.warning("Unknown field {} found among {} in node {}\n".format(field, attrs, id))
+                logger.warning("Unknown field {} found among {} in node {}\n".format(field, _format_node_attributes(attrs), id))
 
             # For fields that point to other AST nodes.
             if isinstance(val, Node):