Rounding to the nearest Integer

Question

I want to Round to the nearest integer if absolute difference to the nearest integer is less or equal than 0.01,

my code is with the test:

import unittest

def round_price(price):

  if abs(price - round(price)) <= 0.01:
    price = int(round(price))
  return price


class TestRounding(unittest.TestCase):
  def test_rounding(self):
    self.assertEqual(round_price(15.98), 15.98)
    self.assertEqual(round_price(15.99), 16)
    self.assertEqual(round_price(16.00), 16)
    self.assertEqual(round_price(16.01), 16)
    self.assertEqual(round_price(16.02), 16.02)

if __name__ == '__main__':
unittest.main()

Im still getting an error when testing,

self.assertEqual(round_price(16.01), 16) AssertionError: 16.01 != 16

Check your if-clause.. maybe you want to check the absolute difference between the original price and the rounded price. — Nras, Nov 17 '15 at 09:09
You could improve your question by saying *what* error you get when testing. What happens, and what did you expect to happen instead? — Mark Dickinson, Nov 17 '15 at 09:10
What are you expecting from `if abs(round(price)) <= 0.01` if `price` is 2.993? — Psytho, Nov 17 '15 at 09:11
I updated my question with the testing and test result, please check — Rami Wafai, Nov 17 '15 at 09:17

score 1 · Accepted Answer · answered Nov 17 '15 at 09:12

1

You need to compare the difference between the price and the rounded price:

def round_price(price):

  if abs(price - round(price)) <= 0.01:
    price = int(round(price))
  return price

answered Nov 17 '15 at 09:12

Petar Ivanov

91,536
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I tried it, it shows the same error, I updated my question with the testing can you please check it? – Rami Wafai Nov 17 '15 at 09:16
2

That is a feature of using floats, if for example you compared with `<= 0.010000000001`, it would probably pass. – Martin Evans Nov 17 '15 at 09:25
1

Your updated code is still wrong... You need `abs(price - round(price))` and not `abs(round(price))` in your `if` statement. – personjerry Nov 17 '15 at 09:28
you are right Martin it is working now – Rami Wafai Nov 17 '15 at 09:30

score 0 · Answer 2 · edited Nov 17 '15 at 09:34

0

def round_price(price):

    if abs(price - round(price)) <= 0.01000001:
        price = round(price)
    return price

edited Nov 17 '15 at 09:34

Ahsanul Haque

10,676
4
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answered Nov 17 '15 at 09:32

Rami Wafai

71
1
9

Rounding to the nearest Integer

2 Answers2