Rounding numbers

What this problem practises

Function bugs are mostly about names and values: positional argument order, default parameters evaluated once at definition time, local versus global scope, and the implicit None returned whenever a function has no return.

This is an output-prediction problem: read the snippet carefully and write down exactly what it prints before anything runs. These questions are interview staples because they test whether you know the language rules, or merely recognise their syntax.

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 snippet

The interactive editor pre-fills exactly this code — read it, then submit your prediction:

print(round(4.5))
print(round(3.456, 2))
print(round(7))

More functions problems

• not operator with different types easy
• Function returning nothing easy
• Inconsistent indentation easy

Keep going

• Output-prediction strategies — how to predict tricky snippets without running them.
• Browse every functions problem in this topic.
• Common Python errors and what they actually mean, plus the Python glossary for any term used on this page.