Rounding float numbers TypeError: 'float' object cannot be interpreted as an integer

Question

Why isn't working, i got the error : TypeError: 'float' object cannot be interpreted as an integer

My code

qtyprice = 0.5221932114882507
lot_size = 0.1

quantity = float(round(qtyprice, lot_size))
print (quantity)

My expected result should be 0.5

When i try this way, the result is 0

qtyprice = 0.5221932114882507
lot_size = 0.1
qtyprice = int(qtyprice)
lot_size = int(lot_size)
quantity = float(round(qtyprice, lot_size))
print (quantity)

Change lot_size to 1. The second parameter in round is how many decimal digits to have, it should be a positive int. — Guy
– Guy, Commented Aug 3, 2022 at 5:53
round(number, digits) - number: Required. The number to be rounded - digits: Optional. The number of decimals to use when rounding the number. Default is 0 — Nik
– Nik, Commented Aug 3, 2022 at 5:59
sometimes the lot size is 0.01, my output would be 0.52, so how to do in this case? — One boy
– One boy, Commented Aug 3, 2022 at 6:30

Ohad Sharet · Accepted Answer · 2022-08-03 06:02:11Z

1

the second parameter of round is the number of digits after the decimal point you want to "keep" after rounding your number, this number should be an int and in your case should be 1

this should do the trick :

qtyprice = 0.5221932114882507
lot_size = 1 #what i changed 

quantity = float(round(qtyprice, lot_size))
print (quantity)

output:

0.5

answered Aug 3, 2022 at 6:02

Ohad Sharet

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2 Comments

One boy Over a year ago

sometimes the lot size is 0.01, my output would be 0.52, so how to do in this case?

Ohad Sharet Over a year ago

I would change lot_size to be 2 (since you want to keep 2 digits after the decimal point)

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