Added basic implementation for Python code evaluation

core/concept.py

@@ -95,11 +95,34 @@ class Concept:
 
 
 class ErrorConcept(Concept):
+    NAME = "Error"
+
     def __init__(self, where=None, pre=None, post=None, body=None, desc=None):
-        Concept.__init__(self, "error", is_builtin=True, where=where, pre=pre, post=post, body=body, desc=desc)
+        Concept.__init__(self, self.NAME, is_builtin=True, where=where, pre=pre, post=post, body=body, desc=desc)
+        self.key = self.NAME
 
     def __repr__(self):
-        return f"({self.id}){self.name} : {self.body}"
+        return f"({self.id}){self.name}: {self.body}"
+
+
+class TooManySuccessConcept(Concept):
+    NAME = "Too many successful items"
+
+    def __init__(self, items=None):
+        super().__init__(self.NAME, body=items)
+        self.key = self.NAME
+
+
+class ReturnValueConcept(Concept):
+    NAME = "Return Value"
+
+    def __init__(self, return_value=None):
+        super().__init__(self.NAME, body=return_value)
+        self.key = self.NAME
+
+    def __repr__(self):
+        return f"({self.id}){self.name}: {self.body}"
+
 
 class Property:
     """