Why does this hang the system up

[Able98]

Thiese two examples seem to hang up the system.

raise FoundException("""\n\nYour password is:\n%s""" % o)

there seems to be no def for it.

in another code example, there is a def and it looks like this:

class FoundException(Exception):
    pass
.
.
.
raise FoundException("""\n\nYour password is:\n%s""" % o)

if the program has reached the point to raise this exception, the program has done it's work and could be ended.

please suggest a way to handle this that will not hang the system up.