CODEWITHSUNDEEP
pythondjangodjango-viewsroundingnumerical-methods
user1746291
user1746291

Reputation: 333

round off function in django

I want to round off some values for my numerical calculations in views like-------

5.5 to 5 OR 549 t0 500 and 599 - 600 (the nearest one)

So I want to use round off OR floor function in django as we used in other languages. Is there any functions related to this in django then please suggest me some functions and also the libraries which i have to import to use these functions.

Thanks.

Upvotes: 0

Views: 2291

Answers (4)

mrts
mrts

Reputation: 18925

If you are doing it in the ORM, you can use a Func() expression, see this answer.

Upvotes: 0

bikeshedder
bikeshedder

Reputation: 7487

When working with floats you can use round, math.ceil and math.floor.

For decimal.Decimal you can use the quantize method which allows you to specify the rounding:

value = decimal.Decimal('0.5')
value.quantize(decimal.Decimal('1'), decimal.ROUND_UP)
value.quantize(decimal.Decimal('1'), decimal.ROUND_DOWN)
value.quantize(decimal.Decimal('1'), decimal.ROUND_HALF_UP)
...

For a list of rounding methods see decimal.Context.

Beware that python uses ROUND_HALF_EVEN by default which is great for statistics but very awkward for financial math. A typical way to round a money amount to centis is the following piece of code:

amount = decimal.Decimal('0.15234')
CENTI = decimal.Decimal('0.01')
value.quantize(CENTI, decimal.ROUND_HALF_UP)

Upvotes: 2

Burhan Khalid
Burhan Khalid

Reputation: 174624

Use decimal in your view:

>>> import decimal
>>> numbers = ['5.5','499','1','0.5']
>>> for i in numbers:
...   the_number = int(decimal.Decimal(i))
...   if the_number / 10:
...      the_number = the_number + 10 - (the_number % 10)
...   print the_number
...
5
500
1
0

If you want to format floats, use floatformat as suggested by Daniel, but it won't do the rounding for you.

Upvotes: 0

Daniel Roseman
Daniel Roseman

Reputation: 599580

You don't say if you're trying to do this in a template or elsewhere.

In a template, you can use the floatformat filter.

Otherwise, it's just Python, so you can use the normal Python rounding functions.

Upvotes: 2

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