Why does Python’s `/` operator return a float for integer division?

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Asked By MellowPine42 On

I'm trying to understand Python's division behavior. When I run `100 / 25`, the result is `4.0` instead of the integer `4`, even though both operands are integers. Why does Python return a float, and how should I get an integer result when that's what I need?

3 Answers

Answered By CedarFox7 On

In Python, `/` always means true division and returns a floating-point result, even when the answer happens to be a whole number. This keeps the operator consistent: `1 / 2` can return `0.5` without needing special rules. If you want floor division, use `//`, so `100 // 25` produces `4` and `40 // 3` produces `13`.

Answered By QuietMarble8 On

Python 2 handled this differently: dividing two integers could produce an integer, while using a floating-point operand produced a float. Python 3 changed `/` to always perform true division, so use `//` when you specifically want an integer-style result.

Answered By OrbitLemon3 On

The result type is kept predictable instead of changing based on whether the division comes out evenly. In some older languages, integer operands caused integer division, which could silently discard the fractional part. Python makes you explicitly choose integer-style division with `//`.

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