work around pattern of passing "**locals()" to str.format which may collide with argument names

Author: timfel

graalpython/lib-graalpython/str.py

@@ -339,9 +339,9 @@ def formatter_parser(self):
         return iter(self.parser_list)
 
 
-def strformat(self, *args, **kwargs):
-    template = TemplateFormatter(self)
-    return template.build(args, kwargs)
+def strformat(___self, *___args, **___kwargs):
+    template = TemplateFormatter(___self)
+    return template.build(___args, ___kwargs)
 
 
 str.format = strformat