Raising exceptions when an exception is already present in Python 3

Question

What happens to my first exception (A) when the second (B) is raised in the following code?

class A(Exception): pass
class B(Except         


        

Answer 1

Answering to question 3, you can use:

raise B('second') from None

Which will remove the exception A traceback.

Traceback (most recent call last):
  File "raising_more_exceptions.py", line 8, in 
    raise B('second')
__main__.B: second