swapcase() — Python Technical Interview Questions & Answers

swapcase()

swapcase()

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

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

Code Examples for swapcase()

Example

# swapcase()
print("Asha".swapcase())

swapcase() — output: aSHA.

How to Explain swapcase() to an Interviewer

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

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

What does the example print, and why?

swapcase() — output: aSHA

What mistake do freshers make with swapcase()?

swapcase does not change the original string in place.