Python · Theory

set()

Theory

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set() is built into Python. You do not import it. Freshers only need one honest call and the printed result — not a long definition.

set() — output — {1, 2, 3}. Duplicates gone.

Wrong type often raises TypeError. Empty values matter for bool/all/any. Don’t mix set up with a similar name (sorted vs sort, int vs float).

Diagram

{1, 2, 2, 3}
         │ unique
         ▼
      {1, 2, 3}

Exam tip

Call set() once and say what prints.

# set()
print(set([1, 2, 2, 3]))

set() — output: {1, 2, 3}. Duplicates gone.