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Python · Theory

expandtabs(tabsize = 8)

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Theory

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expandtabs(tabsize = 8)

expandtabs 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.

expandtabs(tabsize = 8) — output — A B. Tab becomes spaces.

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

Exam tip

Call expandtabs on one real word and say what prints.

Example

# expandtabs(tabsize = 8)
print("A\tB".expandtabs(4))

expandtabs(tabsize = 8) — output: A B. Tab becomes spaces.

Short notes

  • Defexpandtabs works on str.
  • Ruleexpandtabs usually returns a new string.
  • Trapexpandtabs does not change the original string in place.

Questions

1

Explain expandtabs(tabsize = 8) 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 expandtabs(tabsize = 8)?

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