Python Sum() Function Is WRONG! #python #programming #coding

[grapes]

It's called floating point rounding error. As everyone who codes should know.

[davidpement]

Mathematicians: I see nothing wrong with this.

[TomiDJtal]

Except that the sum function is doing exactly what it's supposed to, the problem is simply that floating points number are not infinitely precise and so 9.999 is actually the correct answer. You need additionnal processing to get 10 and that's not always what you want.

[jakob]

not really a flaw in the python function just how floating points work. Although the python hate is apprecihated this is not its fault. It ironically also shows why you should learn coding with a type strong language

[thefoe]

this is not an error, it's a correct computation becouse you can't write down 0.1 decimal in binary it's periodic 0.0(0011) fraction.

[CorruptMem]

That aint a sum() exclusive problem, neither is it exclusive to python

[OriginalCloud]

This example is used in the Python documentation for Math.fsum().

[eryarer]

I asume you know what the binary problem is with decimals

[davidfreer]

“Did you know there is a major flaw in python?” - should have stopped there 😂

[ttrss]

Is it incorrect or is it floating point addition

[cypherparadigm]

Except Computers only do what we tell them to do. They don't have thoughts. So when it outputs a number, you're human brain says no its equal to 1, but the computer the numbers and added them together perfectly, without bias. And when you add the Math Function instead of just getting the sum of the numbers, you introduce a new rule set for the numbers based on a pattern defined by humans. Still doesn't make it equal one, and I'll die on this hill, cause i think anyone that thinks 1 can be divided by three in the first place is incompetent, and shouldn't be allowed to voice their opinions on the internet. Because if you divide one you can get two equal parts but one part will always be larger. Cut a pizza into three cut a cake into three, it will never be exactly the same mass in all three portions without removing a portion entirely, no matter how infintecimally small.

[uxkkvpm]

Someone doesn’t know how computers work

[deadpoolspeaking]

Which ide you are using??
I am just a beginner!

[Levnt]

Couldn’t you just do print(round(sum(x), 1)) ?

[God_f_Death]

0.9999 = 1 is a proof, I learnt in Highschool.