unsupported operand type(s) for *: 'float' and 'Decimal'
I'm just playing around learning classes functions etc, So I decided to create a simple function what should give me tax amount.
this is my code so far.
class VAT_calculator:
"""
A set of methods for VAT calculations.
"""
def __init__(self, amount=None):
self.amount = amount
self.VAT = decimal.Decimal('0.095')
def initialize(self):
self.amount = 0
def total_with_VAT(self):
"""
Returns amount with VAT added.
"""
if not self.amount:
msg = u"Cannot add VAT if no amount is passed!'"
raise ValidationError(msg)
return (self.amount * self.VAT).quantize(self.amount, rounding=decimal.ROUND_UP)
My issue is I'm getting the following error:
unsupported operand type(s) for *: 'float' and 'Decimal'**
I don't see why this should not work!
Solution 1:
It seems like self.VAT
is of decimal.Decimal
type and self.amount
is a float
, thing that you can't do.
Try decimal.Decimal(self.amount) * self.VAT
instead.
Solution 2:
Your issue is, as the error says, that you're trying to multiply a Decimal
by a float
The simplest solution is to rewrite any reference to amount
declaring it as a Decimal object:
self.amount = decimal.Decimal(float(amount))
and in initialize
:
self.amount = decimal.Decimal('0.0')
Another option would be to declare Decimals in your final line:
return (decimal.Decimal(float(self.amount)) * self.VAT).quantize(decimal.Decimal(float(self.amount)), rounding=decimal.ROUND_UP)
...but that seems messier.