can i raise an exception in a try clause?

[Skaperen]

there are these two kinds of exceptions: those that "happen" and those that are explicitly raised. the latter probably covers most everything because implementations have to decide the case for exceptions.

there are these two kinds of exceptions: those that are explicitly raised in a try clause and those that happen somewhere else as a result of what is being done in a try clause. the compiler, perhaps when optimizing, could shortcut the explicit raise because it sees a match between the exception being raised and that exception being one that is handled right there.

try:
    if foo:
        raise bar()
    duh(1)
except bar:
    duh(2)

that would be a long way to decide how to call duh(). maybe the compiler might try to optimize it and do:

duh(1 if foo else 2)

would that change have an impact? i don't really know. that's why i'm asking.