there is no thread module in Python 3 any more, so need to check for threading

cmeerw · cmeerw · commit aff1b2e40001 · 2020-02-06T19:03:00.000Z
instead
diff --git a/roundup/scripts/roundup_server.py b/roundup/scripts/roundup_server.py
@@ -95,7 +95,7 @@
 # "debug" means "none" + no tracker/template cache
 MULTIPROCESS_TYPES = ["debug", "none"]
 try:
-    import thread  # nosrc: F401
+    import threading  # nosrc: F401
 except ImportError:
     pass
 else:
