Missing Colon in for Loop

What this problem practises

Loops are where off-by-one bugs live. range() excludes its stop value, the loop variable keeps its last value even after the loop ends, and break versus continue changes the flow in ways that are easy to misread when you skim.

This is a fix-the-bug problem: a short program is given in its broken state, and the task is to repair the code so it produces the required output. The interactive editor runs your fixed version in the browser and checks it for you — no setup, no local interpreter.

Difficulty: easy — the fix or the trick is normally a single line, and a careful read should be enough.

The challenge

The code runs in PyDebug’s in-browser compiler. Open the problem, run the snippet, watch the exact error or output, and keep iterating until it is right. Signed-in solves count toward XP and your daily streak.

The error it raises

Run the broken snippet and Python stops with this exact error: SyntaxError: expected ':'. Match it to the Python errors guide, then repair the line that produced it — knowing the message is half the fix.

The snippet

The interactive editor pre-fills exactly this code, broken and ready to repair:

for i in range(5)
    print(i)

More loops problems

• for loop with range and step medium
• enumerate with a start value easy
• else clause on a for loop medium

Keep going

• Python debugging guide — a systematic method for finding bugs like this one fast.
• Browse every loops problem in this topic.
• Common Python errors and what they actually mean, plus the Python glossary for any term used on this page.