How can you execute a command at the end of a for loop?

Question

I have the following code

for x in list:
    if x.getValue == variableValue: 
        Print('Found')

I want to print a statement that says "no matches found" on the last iteration of the loop.

Is there anyway to know if the x currently being run through the for loop is the last x in the list?

Answer 1

for x in list:
    if x.getValue == variableValue: 
        print('Found')
        break
else:
    print('not found')

This for else also works with while else where the else clause runs only if the iterable (e.g. list) is exhausted and no break has happened.

There are many who find this construct confusing to read, myself included.

Answer 2

Edit:

The updated question has a simple answer, no. Arbitrary iterators have no idea if they are on their last item, so there is no way for the for loop to know.

That said, the value in a loop isn't constrained to the loop, so x directly after the end of the loop will always be the last value.

---

If you wish to continue looping, you can simply set a flag:

found = False
for x in some_list:
    if x.value == value: 
        print('Found')
        found = True

if not found:
    print("Not Found.")

If you didn't want to do something on each step of the loop, you can use any() and a generator expression to find out there are no matches easily:

if not any(x.value == value for x in some_list):
    print("Not Found.")