isupper() — Python Technical Interview Questions & Answers

isupper()

isupper()

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

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

Code Examples for isupper()

Example

# isupper()
print("ASHA".isupper())

isupper() — output: True.

How to Explain isupper() to an Interviewer

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

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

What does the example print, and why?

isupper() — output: True

What mistake do freshers make with isupper()?

isupper does not change the original string in place.