How to keep my numbers from rounding?

Question

I have some code that takes values from a dictionary and attempts to figure out the per unit price of an item. However, I cannot figure out how to keep the values from rounding.

If I do this:

total_price = int(item['Item Price'][1:]) #First character is a dollar sign
qty = int(item['Quantity'])
unit_price = total_price/qty

I get this error:

ValueError: invalid literal for int() with base 10: '88.75'

So, I tried floating the value:

total_price = int(float(item['Item Price'][1:]))
qty = int(item['Quantity'])
unit_price = total_price/qty

Which doesn't return an error, but it then rounds up and I only get whole numbers.

How can I get the actual per piece price and not a rounded value? Thanks

If you don't want whole numbers, then why are you using an `int`? — Oliver Charlesworth, Jun 04 '13 at 21:38
Can you show some examples number you want to get along with the strings quantity and price. — Mike Müller, Jun 04 '13 at 21:41
Besides echoing @Oli's comment, I'm surprised that anything you've tried rounds *up*. — John Y, Jun 04 '13 at 21:42
Don't worry about deleting the question, if it needs to be gone the community will get around to deleting it eventually. It's sometimes useful to have different search terms that lead to the same answer. — Mark Ransom, Jun 04 '13 at 21:49

score 0 · Accepted Answer · answered Jun 04 '13 at 21:38

Change your qty and total_price to be a float:

total_price = float(item['Item Price'][1:])
qty = float(item['Quantity'])

This will cause the division to be between two floating point values.

Using int explicitly says you want integers, which gives you whole numbers.

score 0 · Answer 2 · answered Jun 04 '13 at 21:40

0

The error is occurring during division

>>> print 3/2
1
>>> print 3.0/2
1.5
>>>

answered Jun 04 '13 at 21:40

Kartik

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How to keep my numbers from rounding?

2 Answers2