Add some better trace message to help debug

Author: cderv

src/resources/jupyter/jupyter.py

@@ -226,19 +226,21 @@ def run_server_subprocess(options, status):
 # run a notebook directly (not a server)
 def run_notebook(options, status):
 
-   # run notebook w/ some special exception handling. note that we don't 
+   # run notebook w/ some special exception handling. note that we don't
    # log exceptions here b/c they are considered normal course of execution
    # for errors that occur in notebook cells
-   try:   
+   try:
+      trace('Running notebook_execute')
       notebook_execute(options, status)
    except Exception as e:
+      trace(f'run_notebook caught exception: {type(e).__name__}')
       # CellExecutionError for execution at the terminal includes a bunch
       # of extra stack frames internal to this script. remove them
       msg = str(e)
       kCellExecutionError = "nbclient.exceptions.CellExecutionError: "
       loc = msg.find(kCellExecutionError)
       if loc != -1:
-         msg = msg[loc + len(kCellExecutionError)]
+         msg = msg[loc + len(kCellExecutionError):]
       sys.stderr.write("\n\n" + msg + "\n")
       sys.stderr.flush()
       sys.exit(1)

src/resources/jupyter/notebook.py

@@ -520,6 +520,8 @@ def cell_execute(client, cell, index, execution_count, eval_default, store_histo
    allow_errors = cell_options.get('error')
 
    trace(f"cell_execute with eval={eval}")
+   if (allow_errors == True):
+      trace(f"cell_execute with allow_errors={allow_errors}")
 
    # execute if eval is active
    if eval == True:
@@ -556,9 +558,10 @@ def cell_execute(client, cell, index, execution_count, eval_default, store_histo
       # Check for display errors in output (respecting both global and cell settings)
       cell_allows_errors = allow_errors if allow_errors is not None else client.allow_errors
       if not cell_allows_errors:
+         trace("Cell does not allow errors: checking for uncaught errors")
          for output in cell.outputs:
             if output.get('output_type') == 'error':
-               trace("Uncaught error found in output")
+               trace("   Uncaught error found in output")
                from nbclient.exceptions import CellExecutionError
                error_name = output.get('ename', 'Error')
                error_value = output.get('evalue', '')