Round Down and Round Up float to negative decimals point in python

Question

I'm looking for something to round up and round down at 1,2, and -1 decimal points in python, I have written some logic through it I am able to get the right values for +ve points but still looking round down -ve values.

my code is as -:

import decimal

outcome = '2156.24611496733'
rounding="Alwayes Down" 
decimal_place = -1

#   for positive values
if rounding == "Alwayes Up":
    decimal.getcontext().rounding = decimal.ROUND_UP

elif rounding == "Alwayes Down":
    decimal.getcontext().rounding = decimal.ROUND_DOWN

#   for negative values
if rounding == "Alwayes Down":
    print(round(float(outcome), decimal_place))

rounding_string = "1." + "0"*int(decimal_place)
decimal_outcome = decimal.Decimal(str(outcome)).quantize(decimal.Decimal(rounding_string))

print(decimal_outcome)

Table value is like -

I am expecting values like

Please, share your DataFrame https://stackoverflow.com/questions/20109391/how-to-make-good-reproducible-pandas-examples — alec_djinn, May 20 '22 at 09:10
I have added a data frame, I am looking for Always Down -1 point. — radhey_mishra, May 20 '22 at 09:17
There is no rounding down function in python only truncating, like this : x = 622222.5454//1; print(x) — gerald, May 20 '22 at 09:31
ok, I am looking to round Down at -1 position. and there are round-down options after setting context i.e working fine for me. https://www.knowledgehut.com/blog/programming/python-rounding-numbers — radhey_mishra, May 20 '22 at 09:35

score 0 · Accepted Answer · answered May 20 '22 at 10:18

This is the complete solution that meets my matrix.

import decimal

outcome = '622222.545454545'
rounding="Alwayes Up" 
decimal_place = -1

#   for positive values
if rounding == "Alwayes Up":
    decimal.getcontext().rounding = decimal.ROUND_UP

elif rounding == "Alwayes Down":
    decimal.getcontext().rounding = decimal.ROUND_DOWN
    
rounding_string = "1." + "0"*int(decimal_place)
decimal_outcome = decimal.Decimal(str(outcome)).quantize(decimal.Decimal(rounding_string))

print(decimal_outcome)

# for negative values
if rounding == "Alwayes Up":
    print(round(float(outcome), decimal_place))

elif rounding == "Alwayes Up":
    decimal.getcontext().rounding = decimal.ROUND_UP
    rounding_string = "1." + "0"*int(decimal_place)
    decimal_outcome = decimal.Decimal(str(outcome)).quantize(decimal.Decimal(rounding_string))
    print(float(decimal_outcome))

Round Down and Round Up float to negative decimals point in python

1 Answers1