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

try:
    try:
        int('a')
    except ValueError as e:
        raise ValueError('There is a problem: {0}'.format(e))
except ValueError as err:
    print err

prints:

There is a problem: invalid literal for int() with base 10: 'a'