show the NAN logoerror if a block wants a number but gets a non-number

1 files changed, 5 insertions, 0 deletions

diff --git a/TurtleArt/tatype.py b/TurtleArt/tatype.py
index 1402014..46c5921 100644
--- a/TurtleArt/tatype.py
+++ b/TurtleArt/tatype.py
@@ -68,6 +68,7 @@ class TypeDisjunction(tuple,Type):
         return "".join(s)
 
 
+# individual types
 TYPE_OBJECT = Type('TYPE_OBJECT', 0)
 TYPE_BOOL = Type('TYPE_BOOL', 5)
 TYPE_BOX = Type('TYPE_BOX', 8)  # special type for the unknown content of a box
@@ -81,10 +82,14 @@ TYPE_NUMBER = Type('TYPE_NUMBER', 6)  # shortcut to avoid a TypeDisjunction
 TYPE_NUMERIC_STRING = Type('TYPE_NUMERIC_STRING', 7)
 TYPE_STRING = Type('TYPE_STRING', 9)
 
+# groups/ classes of types
+TYPES_NUMERIC = (TYPE_FLOAT, TYPE_INT, TYPE_NUMBER)
+
 
 BOX_AST = ast.Name(id='BOX', ctx=ast.Load)
 ACTION_AST = ast.Name(id='ACTION', ctx=ast.Load)
 
+
 def get_type(x):
     """ Return the most specific type in the type hierarchy that applies to x
     and a boolean indicating whether x is an AST. If the type cannot be