isinstance() — Python Technical Interview Questions & Answers

isinstance()

isinstance()

  • 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).

Technical Interview Tip: Call isinstance() once and say what prints.

Code Examples for isinstance()

Example

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

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

How to Explain isinstance() to an Interviewer

Explain isinstance() as if you are teaching a junior — definition, then one tiny script.

isinstance() is built-in — no import. One call + exact output.

What does the example print, and why?

isinstance() — output: True then True

What mistake do freshers make with isinstance()?

Wrong type → TypeError.