Python Oddities: did you know THIS about the round() function? #python #programming

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[ABaumstumpf]

Only 0.5 is rounded to even and "reducing the error" is a vague statement as it changes the type of expected error. Depending on the numbers chosen it can devolve into either always up or always down, but it has an inherent bias towards even numbers.

And this is not a Python oddity nor Pythons decision:
Python is using IEEE-754 floats and it is that specification that defines how floats are rounded.

[thatotherandrew_]

I thought it was some quirk of float representation, like with 0.1 + 0.2, but turns out it was fully intentional! That sounds like it would've been a pain to implement, but it's very cool!

[thierryrioual]

this channel should have way more subscribers

[terageekg]

Cool didn't know that.
Love your videos

[ross]

I strangely learned this in machine shop. Shop teacher was big on probability as it relates to measurement. Like "What are the chances you can actually machine those tolerances?"

[no-better-name]

this one i have seen in PascalABC, i think. called it banker's rounding

[mart_of_chaos]

But is there a "normal" regular round function in python?

[mumujibirb]

What about rounding off? It depends on the digit we are rounding, so 7.5 -> 8, -> 7, 7.4 -> 7 etc.

[curtiswfranks]

Is this because it rounds in the way that mathematicians do (toward the nearest even integer when the input is equally spaced between two integers)? If so, this is a natural and unbiased approach.

[cmilkau]

Round to nearest even has been around since the 8087 and probably longer, hasn't it?

[calcubite]

yeah great, but how do we do rounding as we were taught in school?

[tommyshelby]

Where are more videos bruh upload upload upload more

[vinnieg]

so what does a 8.6 get rounded down to 8? You said round down to the nearest even integer. I dont'get it

[slimysnail]

plz talk slowly with more visualization if possible

[cipherxen]

Is it rounding to nearest even number? If not, how does it work in multi-threading?

[javier]

That's how it's always been, what did they teach you to do with halves?