Why Does Python's Integer Division Round Down?

Integer Division in Python: Why Do Division Results Round Down?

When dividing two integers in Python, the resulting value is automatically rounded to an integer. This can be confusing, especially when you expect a floating-point value.

The Explanation

Python's integer division truncates the decimal portion of the result. Thus, in the expression (20-10) / (100-10), both operands are integers, and the result is truncated to 0, which is then cast back to an integer.

How to Fix It

To obtain a floating-point result, you can cast one of the operands to a float:

float((20 - 10) / (100 - 10))

Alternatively, you can use Python's division import from the future module:

from __future__ import division
(20 - 10) / (100 - 10)

This import changes the division operator to perform floating-point division, even when the operands are integers.

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