Issue #16972: Have site.addpackage() consider known paths even when

none are explicitly passed in.

Lib/site.py

@@ -146,7 +146,7 @@ def addpackage(sitedir, name, known_paths):
        and add that to known_paths, or execute it if it starts with 'import '.
     """
     if known_paths is None:
-        _init_pathinfo()
+        known_paths = _init_pathinfo()
         reset = 1
     else:
         reset = 0

Misc/NEWS

@@ -218,6 +218,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #180022: Have site.addpackage() consider already known paths even when
+  none are explicitly passed in. Bug report and fix by Kirill.
+
 - Issue #1602133: on Mac OS X a shared library build (``--enable-shared``)
   now fills the ``os.environ`` variable correctly.