Small improvement to django.template.resolve_variable -- isdigit() instead of 0123456789

git-svn-id: http://code.djangoproject.com/svn/django/trunk@3098 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/template/__init__.py

@@ -614,7 +614,7 @@ def resolve_variable(path, context):
 
     (The example assumes VARIABLE_ATTRIBUTE_SEPARATOR is '.')
     """
-    if path[0] in '0123456789':
+    if path[0].isdigit():
         number_type = '.' in path and float or int
         try:
             current = number_type(path)