Python

15 September 2026 11:55

I just told you
What other information you need?

Python

15 September 2026 11:45

If you are doing financial math - use Decimal

If you are calculating a trajectory for a rocket, use external libraries

DO NOT use Fraction to represent floating point numbers

That's it

Python

15 September 2026 11:42

Fractions get slower and slower as you work with them, and are rarely used for representing floating point numbers

Python

15 September 2026 11:38

float(decimal.Decimal('.1') + decimal.Decimal('.2'))
and
float(fractions.Fraction('0.1') + fractions.Fraction('0.2'))

so will should i use the fraction?

Python

15 September 2026 11:35

If you were to calculate floats for currency, prices, legal and tax documents
Then yes, you use Decimal
But as its software based and on base-10 rule, it makes it slower to work with then other solutions

But for high precision and high speed calculation needed for example in data science or calculating a rocket orbit
You need something with high precision, where the error at the 50th decimal place does not affect the outcome

So it comes down to what you are actually calculating

Python

14 September 2026 21:53

No, that's not what we do here.

Python

14 September 2026 21:45

/channel/Python/2266296

Python

14 September 2026 21:29

What are you calculating?

Python

14 September 2026 20:16

why library i listen we should to do

Decimal("0.1") + Decimal("0.2")

Python

13 September 2026 07:36

That was too easy, thx for the assist

Python

13 September 2026 07:35

In a windows computer, as any other program, you download the installer, open it and follow the assistant

Python

12 September 2026 05:46

Mildred Raines, please verify you are human by clicking the button below. You have 90 seconds.

Python

10 September 2026 14:14

Jokes are better made at @pythonofftopic. It's better not to make jokes here. Be sure to delete this very funny joke.

Python

10 September 2026 10:59

Don’t Assume Floating-Point Numbers Are Perfectly Accurate
https://inventwithpython.com/beyond/chapter8.html

Python

10 September 2026 10:39

why python gives 0.30000000000000004 when adding 0.1 + 0.2

Python

15 September 2026 11:51

so which u will say i should learn, so that from now i will Learning Using simple fast speed of floating calculation for my own shopping app, school apps like this?

Python

15 September 2026 11:44

you have just stop my mouth 😅 and just push me into the sea of confusion

Python

15 September 2026 11:38

Read again the above message
And decide for yourself

And float(Decimal) does not make apsolutly no sense

Python

15 September 2026 11:37

so n past u say :-> for all price, tax tables i should to always use the decimal.Decimal. from then i switched to this for all my code.
now what u say i will use in real production case. !

Python

15 September 2026 11:20

i was calculating

Decimal("0.1")+Decimal("0.2")
decimal adding without causing any floating problem without using any external library!

Python

14 September 2026 21:49

Can anyone help me with python's technology to build an ai driven app

Python

14 September 2026 21:43

Yes, we have established that already.

Python

14 September 2026 20:28

i means, as he says we will use library here for this!!!
but i found normally with the Decimal we can solve the float problem. so ehat rhe library be say to use

Python

14 September 2026 08:31

That's the case with all programming languages
Floating numbers are handled with a binary representation, so there will be an overflow at times
There are libraries designed to handle that though

Python

13 September 2026 07:36

thanks all of you guys

Python

13 September 2026 07:33

How to install python

Python

11 September 2026 16:11

Use Decimal() from decimal module.

Python

10 September 2026 14:13

I didn't get it

Python

10 September 2026 10:45

https://0.30000000000000004.com/

Python

09 September 2026 17:58

But if you know problems that can cause this decision and if you can bear upon with it - you can use pydantic, that's legal for pragmatic architecture
I've used ORM in domain entities and that's ok if you know what you are doing (https://github.com/MagM1go/marionette/blob/main/src/marionette/domain/entities/character.py)

https://github.com/MagM1go/marionette/blob/main/README_en.md