[py3k] Tuple unpacking is now forbidden in function arguments

Related to #268148.

transforms/python.py

@@ -70,8 +70,9 @@ class Parser:
                 msg, self.raw[self.lines[line]:]))
         self.out.write('\n</pre>\n')
 
-    def __call__(self, toktype, toktext, (srow,scol), (erow,ecol), line):
+    def __call__(self, toktype, toktext, sparams, _, line):
         """Token handler"""
+        srow, scol = sparams
         # calculate new positions
         oldpos = self.pos
         newpos = self.lines[srow] + scol