Optionally avoid custom node errors.

src/sisl/nodes/context.py

@@ -9,7 +9,11 @@
     # On initialization, should the node compute? If None, defaults to `lazy`.
     lazy_init=None,
     # The level of logs stored in the node.
-    log_level="INFO"
+    log_level="INFO",
+    # Whether to raise a custom error exception (e.g. NodeCalcError) By default 
+    # it is turned off because it can obscure the real problem by not showing it
+    # in the last traceback frame.
+    raise_custom_errors=False,
 )
 
 # Temporal contexts stack. It should not be used directly by users, the aim of this

src/sisl/nodes/node.py

@@ -41,7 +41,7 @@
         # Should make this more specific
         return (f"Some input is not right in {self._node} and could not be parsed")
 
 class Node(NDArrayOperatorsMixin):
     """Generic class for nodes.
 
     A node is a process that runs with some inputs and returns some outputs.
@@ -90,6 +90,8 @@
     # Whether the node has errored during the last execution
     # with the current inputs.
     _errored: bool
+    # The error that was raised during the last execution
+    _error: Optional[NodeError] = None
 
     # Logs of the node's execution.
     _logger: logging.Logger
@@ -133,6 +135,7 @@
 
         self._outdated = True
         self._errored = False
+        self._error = None
 
         self._logger = logging.getLogger(
             str(id(self))
@@ -370,12 +373,18 @@
                 self.logs += logs.stream.getvalue()
                 logs.close()
                 self._errored = True
-                raise NodeCalcError(self, e, evaluated_inputs)
+                self._error = NodeCalcError(self, e, evaluated_inputs)
+
+                if self.context['raise_custom_errors']:
+                    raise self._error
+                else:
+                    raise e
 
             self._nupdates += 1
             self._prev_evaluated_inputs = evaluated_inputs
             self._outdated = False
             self._errored = False
+            self._error = None
         else:
             self._logger.info(f"No need to evaluate")