Python weird sum

Question

Why does 12.7+18.4 does not equal 31.!? Python prints out 31.099999 instead?
Someone?

Answer 1

Floating point numbers (floats) are not 100% accurate

Answer 2

This is an example of the floating point issue that we have in modern day programming calculations.

See here:
https://en.m.wikipedia.org/wiki/Floating-point_arithmetic