Swap public and system ID in start_doctype_decl. Fixes #780300.

Doc/whatsnew/whatsnew24.tex

@@ -561,6 +561,10 @@ changes to your code:
 \item \function{dircache.listdir()} now passes exceptions to the caller
       instead of returning empty lists.
 
+\item \function{LexicalHandler.startDTD} used to receive public and system ID
+  in the wrong order. This has been corrected; applications relying on the
+  wrong order need to be fixed.
+
 \end{itemize}
 
 

Lib/xml/sax/expatreader.py

@@ -361,7 +361,7 @@ def start_namespace_decl(self, prefix, uri):
     def end_namespace_decl(self, prefix):
         self._cont_handler.endPrefixMapping(prefix)
 
-    def start_doctype_decl(self, name, pubid, sysid, has_internal_subset):
+    def start_doctype_decl(self, name, sysid, pubid, has_internal_subset):
         self._lex_handler_prop.startDTD(name, pubid, sysid)
 
     def unparsed_entity_decl(self, name, base, sysid, pubid, notation_name):

Misc/NEWS

@@ -306,6 +306,9 @@ Extension modules
 Library
 -------
 
+- Bug #780300: Swap public and system ID in LexicalHandler.startDTD.
+  Applications relying on the wrong order need to be corrected.
+
 - Bug #926075: Fixed a bug that returns a wrong pattern object
   for a string or unicode object in sre.compile() when a different
   type pattern with the same value exists.