--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sat_website/templatetags/utils.py	Wed Jan 21 20:07:20 2015 +0100
@@ -0,0 +1,14 @@
+from django import template
+register = template.Library()
+
+@register.filter
+def is_tuple(value):
+    """Tell if this value is a tuple or not.
+
+    @param value (obj): any object
+    @return: True if value is a tuple
+    """
+    # XXX: we would like to have is_type with an argument instead, but it would
+    # rely on a strange comparison - isinstance(value, arg) doesn't work here
+    return type(value) == tuple
+