How to correctly implement the reduction of large numbers?

Question

Python

Recently it was necessary to write a system for reducing numbers, that is, 1.000 - 1K, 2.000.000 - 2M. I came up with a simple solution for myself:

def shortint(textint):
        textint = str(textint)
        m = {0: '', 3: 'K', 6: 'M', 9: 'B', 12: 'T'}
        k = (len(textint)-1)//3*3
        if k == 0:
            return textint
        else:
            return textint[:-k] + m[k]

I understand that the solution is not entirely correct.
However, now it took a reduction to tenths, that is, 1.000 - 1.0K, 123.456 - 123.5K.
Hint where to look to implement it correctly :)

Answer 1

hint

use the decimal logarithm

A bunch of solutions from libraries to custom
stackoverflow.com/questions/10969759/python-librar...