Why Does Integer Division in Python 3 Return a Float, and How Can I Get an Integer Result?

Division Conundrum: Integers Divide into Decimals in Python 3

In Python 3, performing integer division (e.g., 2/2) unexpectedly yields a float (1.0) instead of an integer. This behavior differs from earlier Python versions where integer division resulted in an integer outcome.

Origin of the Shift

This change was introduced in Python 3 to resolve ambiguities and enhance mathematical consistency. Prior to Python 3, integer division in Python 2 behaved differently, rounding down to the nearest integer (e.g., 2/2 yielded 0).

Addressing the Dilemma

To address this issue, Python 3 introduced the // operator for floor division, which ensures integer division and returns the rounded-down result (e.g., 2//2 yields 1).

Recommendation

As a best practice, always use the // operator for floor division in Python 3. This ensures that you obtain the intended integer outcome. Casting is unnecessary as the // operator explicitly performs floor division.

Further Exploration

For more information, consult PEP-238: Changing the Division Operator. This document details the rationale behind the change and provides additional insights.

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