Python · Theory

isinstance()

Theory

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

isinstance() — output — True then True. Type check before you assume.

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

Exam tip

Call isinstance() once and say what prints.

# isinstance()
print(isinstance(12, int))
print(isinstance("Asha", str))

isinstance() — output: True then True. Type check before you assume.