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Python · Theory

center(width ,fillchar)

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Theory

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center(width ,fillchar)

center 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.

center(width ,fillchar) — output — --Asha--- (width 10).

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

Exam tip

Call center on one real word and say what prints.

Example

# center(width ,fillchar)
print("Asha".center(10, "-"))

center(width ,fillchar) — output: --Asha--- (width 10).

Short notes

  • Defcenter works on str.
  • Rulecenter usually returns a new string.
  • Trapcenter does not change the original string in place.

Questions

1

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

2

What does the example print, and why?

3

What mistake do freshers make with center(width ,fillchar)?

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