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Balanced Brackets

Intermediate · Write the code · from 50 Python Practice Problems with Instant Answer Checking (Beginner to Advanced)

From the lesson: 50 Python Practice Problems with Instant Answer Checking (Beginner to Advanced)

Fifty problems, each with a code editor and real tests. Write your solution, press Check, and see exactly which cases pass. Stuck? Hints reveal one at a time, and the solution unlocks once you have checked at least once. Your code and progress are saved in this browser.

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Write is_balanced(s) that returns True if every (, [ and { is closed by the matching bracket in the right order. Other characters are ignored.

is_balanced("{[()()]}")  ->  True
is_balanced("([)]")      ->  False
def is_balanced(s):
pass
Solution unlocks after your first Check

What Check runs

Your code runs first, then each of these lines. The output must match exactly.

RunsExpected output
is_balanced("{[()()]}")True
is_balanced("([)]")False
is_balanced("print(len([1, 2]))")True

More practice problems

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