Exception Notes

Exceptions can have notes attached to them. These notes can be used to add more information to the exception. They can be added using the add_note method of the exception.

try:
    # Code that might raise an exception
except ExceptionType as e:
    # Code that handles the exception
    e.add_note("Note")
    raise

Note: This will re-raise the exception with the note attached to it. The notes only have a point if the exception is re-raised, otherwise they are lost.

Near real world example:

def f():
    raise ValueError("ValueError")
 
exceptions = []
for i in range(10):
    try:
        f()
    except ValueError as e:
        e.add_note(f"i = {i}")
        exceptions.append(e)
 
raise ExceptionGroup(exceptions)