Python · Theory

len()

Theory

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

len() — output — 4 then 3. Characters vs list items.

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

Exam tip

Call len() once and say what prints.

# len()
print(len("Asha"))
print(len([80, 90, 70]))

len() — output: 4 then 3. Characters vs list items.