lower() — Python Technical Interview Questions & Answers

lower()

lower()

  • lower is a string helper. You call it on text like "Asha" or "banana". It gives a new string (or a number/True-False). The old string does not change unless you assign the result back.
  • lower() — output: asha.
  • Fresher trap: writing s.lower() and expecting s to update. Strings are immutable. Write s = s.lower(...) if you need the new value (when it returns a string).

Technical Interview Tip: Call lower on one real word and say what prints.

Code Examples for lower()

Example

# lower()
print("ASHA".lower())

lower() — output: asha.

How to Explain lower() to an Interviewer

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

lower works on str. lower usually returns a new string.

What does the example print, and why?

lower() — output: asha

What mistake do freshers make with lower()?

lower does not change the original string in place.