Add option to round down

[JustTheCoolest]

Mod operator can not account for how many significant figures it is rounding. But sigifg.round doesn't seem to provide an option to specifically round only down or only up

[MikeBusuttil]

Can you give an example @JustTheCoolest ?

[JustTheCoolest]

I have a counter for the number of downloads of my product.

I want it to be displayed rounded down with 1 significant figure

21 downloads : 20+ downloads
5 downloads : 5+ downloads
121 downloads : 100+ downloads
199 downloads: 100+ downloads

[MikeBusuttil]

ahh I see. You're right, it doesn't do rounding down out of the box but it can help you build a round_down function:

from sigfig import round

def round_down(x):
    return str(x)[0] + str(round(x, sigfigs=1))[1:]

round_down(21) # 20
round_down(5) # 5
round_down(121) # 100
round_down(199) # 100

[JustTheCoolest]

It doesn't work for 999

self.assertEqual(round_down(999), '900')
AssertionError: '9000' != '900'

Thanks for the idea though. Using similar logic, I wrote this function:

def round_down(x: int | str, sigfigs: int = 1) -> str:
    x = str(x)
    return x[0:sigfigs] + '0' * (len(x) - sigfigs)

[JustTheCoolest]

Also, perhaps keep this issue open as a feature request for the future?

[MikeBusuttil]

It doesn't work for 999

self.assertEqual(round_down(999), '900')
AssertionError: '9000' != '900'

Thanks for the idea though. Using similar logic, I wrote this function:

def round_down(x: int | str, sigfigs: int = 1) -> str:
x = str(x)
return x[0:sigfigs] + '0' * (len(x) - sigfigs)

oh ya good catch, you don't even need sigfig.round to round down! When you have a hammer everything looks like a nail 🤦‍♂️

[MikeBusuttil]

Also, perhaps keep this issue open as a feature request for the future?

Sure, why not