One-time actions when iterating

[ClassicalSoul]

Please note I've made a substantive edit to my original post

Suppose you had the following code, where x is an iterable:

for i in x:
    # do thing 1
    # do thing 2
    if <condition>:
        # do thing 3
        # do thing 4
        continue

But after the condition is met the first time you no longer wish to do thing 4. We could try:

x_iter = iter(x)

for i in x:
    # do thing 1
    # do thing 2
    if <condition>:
        # do thing 3
        # do thing 4
        break

for i in x:
    # do thing 1
    # do thing 2
    if <condition>:
        # do thing 3

But of course we would be repeating code. My question is whether there some shortcut to what I do in the second example.