python division precision

Question

I am aware of floating point being inaccurate and would like to know the best way to get 0.08354 instead of (0.08353999999999999) when I do the following in Python:

d = 8.354/100

print (d)

`round(0.08353999999999999, 6) ` – Padraic Cunningham Oct 21 '16 at 15:13 — Padraic Cunningham, Oct 21 '16 at 15:13

score 6 · Answer 1 · answered Oct 21 '16 at 15:14

6

If you want absolute precision, use Decimals:

>>> import decimal
>>> decimal.Decimal('8.354') / 10
Decimal('0.8354')

answered Oct 21 '16 at 15:14

deceze

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score 3 · Accepted Answer · answered Oct 21 '16 at 15:13

3

Use the builtin round() function:

>>> d = 8.354/100
>>> d
0.08353999999999999
>>> round(d, 6)
0.08354
>>>

answered Oct 21 '16 at 15:13

Christian Dean

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python division precision

2 Answers2