upper() — Python Technical Interview Questions & Answers

upper()

upper()

  • upper 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.
  • upper() — output: ASHA.
  • Fresher trap: writing s.upper() and expecting s to update. Strings are immutable. Write s = s.upper(...) if you need the new value (when it returns a string).

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

Code Examples for upper()

Example

# upper()
print("asha".upper())

upper() — output: ASHA.

How to Explain upper() to an Interviewer

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

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

What does the example print, and why?

upper() — output: ASHA

What mistake do freshers make with upper()?

upper does not change the original string in place.