Is there a cleaner way to handle (consecutive) exclusive if-statement in for-loop?

I'm new to Python (I've only used C) and I've discovered new loops such as for/else... So I wonder if I'm ignoring a cleaner way to handle this loop:

flag = 0
for i in range (n):
    if not flag and condition_1:
        statement_1
        flag = 1
    if flag and condition_2:
        statement_2

I need to keep the for counting, because the n-th element that satisfy condition_2 could come strictly after the element I look for condition_1