Help with a for loop quiz question

Hello there, I am currently a novice at python and am studying for the pcep entry level certification but, I am having difficulty understanding the output of the following code:

i included a picture showing the code in question. The answer is explained but it doesn’t click for me. Why does the variable get incremented twice inside the else: branch?

i understand it getting incremented once inside the else branch but I do not understand why it is incremented another time after.

I hope this makes sense and I appreciate anyone who responds back. Thank you

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Thank you.


The else on the for loop here is actually a complete red herring. It’s going to be executed any time the inner loop doesn’t break, which - since there is no break statement in it at all - is inevitable. So the loop is equivalent to this:

others = -1
for i in [1, 2]:
    for j in [1]:
        if i == j:
            others += 1 # first increment
    others += 1 # second increment

Since that second increment happens once for each pass through the outer loop, it will happen twice, which should be obvious if we remove most of the code:

for i in [1, 2]:
    others += 1

I think the description may be misleading you a little; when it says that the variable is “incremented twice”, what it means is that Python will hit that line of code twice - once when i is 1, and once when i is 2. Each time, others will get incremented (by one).

Hope that helps!


Hi Chris,

Yes this really did help me, thank you so much I really appreciate it! :blush: :smile:

Excellent. Keep on asking questions every time you’re confused, and before long, you’ll be answering questions too :slight_smile: