Improve metadata error message to identify the error

Improve metadata error message to identify the error

Author: juankx-bodo

pydough/errors/error_utils.py

@@ -89,6 +89,7 @@ def verify(self, obj: object, error_name: str) -> None:
             `PyDoughMetadataException`: if `obj` did not satisfy the predicate.
         """
         if not self.accept(obj):
+            error_name = f"{error_name}: [{repr(obj)}]"
             raise PyDoughMetadataException(self.error_message(error_name))
 
 
@@ -101,7 +102,7 @@ def accept(self, obj: object) -> bool:
         return isinstance(obj, str) and obj.isidentifier()
 
     def error_message(self, error_name: str) -> str:
-        return f"{error_name} must be a string that is a Python identifier"
+        return f"{error_name} must be a string that is a valid Python identifier"
 
 
 class NoExtraKeys(PyDoughPredicate):

pydough/metadata/graphs/graph_metadata.py

@@ -43,6 +43,7 @@ def __init__(
         synonyms: list[str] | None,
         extra_semantic_info: dict | None,
     ):
+        breakpoint()
         is_valid_name.verify(name, "graph name")
         self._additional_definitions: list[str] | None = additional_definitions
         self._verified_pydough_analysis: list[dict] | None = verified_pydough_analysis