In [6]: import sys

In [7]: node_source = "my node source"

In [8]: try:
   ...:     raise ValueError("spam alot")
   ...: except ValueError as err:
   ...:     msg = f"Failed to auto-convert {type(node_source)} to ColumnDataSource.\n Original error: {err.message}"
   ...:     raise ValueError(msg).with_traceback(sys.exc_info()[2])
   ...: 
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
Cell In[8], line 2
      1 try:
----> 2     raise ValueError("spam alot")
      3 except ValueError as err:

ValueError: spam alot

During handling of the above exception, another exception occurred:

AttributeError                            Traceback (most recent call last)
Cell In[8], line 4
      2     raise ValueError("spam alot")
      3 except ValueError as err:
----> 4     msg = f"Failed to auto-convert {type(node_source)} to ColumnDataSource.\n Original error: {err.message}"
      5     raise ValueError(msg).with_traceback(sys.exc_info()[2])

AttributeError: 'ValueError' object has no attribute 'message'

In [9]: try:
   ...:     raise ValueError("spam alot")
   ...: except ValueError as err:
   ...:     msg = f"Failed to auto-convert {type(node_source)} to ColumnDataSource.\n Original error: {err}"
   ...:     raise ValueError(msg).with_traceback(sys.exc_info()[2])
   ...: 
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
Cell In[9], line 2
      1 try:
----> 2     raise ValueError("spam alot")
      3 except ValueError as err:

ValueError: spam alot

During handling of the above exception, another exception occurred:

ValueError                                Traceback (most recent call last)
Cell In[9], line 5
      3 except ValueError as err:
      4     msg = f"Failed to auto-convert {type(node_source)} to ColumnDataSource.\n Original error: {err}"
----> 5     raise ValueError(msg).with_traceback(sys.exc_info()[2])

Cell In[9], line 2
      1 try:
----> 2     raise ValueError("spam alot")
      3 except ValueError as err:
      4     msg = f"Failed to auto-convert {type(node_source)} to ColumnDataSource.\n Original error: {err}"

ValueError: Failed to auto-convert <class 'str'> to ColumnDataSource.
 Original error: spam alot