How do I raise the same Exception with a custom message in Python?

Question

I have this try block in my code:

try:
    do_something_that_might_raise_an_exception()
except ValueError as err:
    errmsg = \'My custom error         


        

Answer 1

Either raise the new exception with your error message using

raise Exception('your error message')

or

raise ValueError('your error message')

within the place where you want to raise it OR attach (replace) error message into current exception using 'from' (Python 3.x supported only):

except ValueError as e:
  raise ValueError('your message') from e