Python · Theory

callable()

Theory

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

callable() — output — True then False. len can be called; 21 cannot.

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

Exam tip

Call callable() once and say what prints.

# callable()
print(callable(len))
print(callable(21))

callable() — output: True then False. len can be called; 21 cannot.