How to Round the Amount Field After Entering a User?

Question

Hi,
We use odoo 11.
I want the field value to be the amount after entering it by the user ;  convert the last three digits to zero.

from math import log
*    amount = fields.Float(string="Amount",   compute='
_lastzero
'
,required=True)*

@api.multi
*def _lastzero(self): *
digits=3
expo = 10**(int(math.log(self.amount, 10)) -digits+1)
return expo * (self.amount // expo)

*ValueError: math domain error*

Muhammad Faizal NS · Answer

Change
from math import log
to

import math

Ravi Gadhia · Answer

there are some issues
1) math domain error raise when you try to get a log of a negative amount
2) compute fields could not return anything like a function. you have to value of the field inside a function
llike
self.amount = # your expression
3) by default compute field is not stored so  amount value should be store some other field

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