Bug #1446043: correctly raise a LookupError if an encoding name given

to encodings.search_function() contains a dot.

Lib/encodings/__init__.py

@@ -90,7 +90,7 @@ def search_function(encoding):
     else:
         modnames = [norm_encoding]
     for modname in modnames:
-        if not modname:
+        if not modname or '.' in modname:
             continue
         try:
             mod = __import__('encodings.' + modname,

Misc/NEWS

@@ -63,6 +63,9 @@ Core and builtins
 Library
 -------
 
+- Bug #1446043: correctly raise a LookupError if an encoding name given
+  to encodings.search_function() contains a dot.
+
 - Bug #1560617: in pyclbr, return full module name not only for classes,
   but also for functions.