len() — Python Technical Interview Questions & Answers

len()

len()

  • 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).

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

Code Examples for len()

Example

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

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

How to Explain len() to an Interviewer

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

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

What does the example print, and why?

len() — output: 4 then 3

What mistake do freshers make with len()?

Wrong type → TypeError.