[datatypes.py] Changed ValueError to TypeError

datatypes.py

@@ -31,7 +31,7 @@ class Variable:
             if self.type == value.type:
                 object.__setattr__(self, name, value)
             else:
-                raise ValueError(
+                raise TypeError(
                     "Type inequality; cannot assign value of "
                     f"type {value.type} to variable of type {self.type}"
                 )