CODEWITHSUNDEEP
pythondjango
user1958218
user1958218

Reputation: 1621

How can i convert DecimalField to float in Python Django?

I have this form field:

area = forms.DecimalField(max_digits=20)

When I post it I get unicode data:

raise Exception(type(a.get('area',))

the result is

<type 'unicode'>

How can I convert that to float? I want to perform an arithmetic operation on the result.

If I do this:

float(a.get('area', '0'))

Then I get this

float() argument must be a string or a number

Upvotes: 5

Views: 17663

Answers (3)

Henrik Andersson
Henrik Andersson

Reputation: 47172

If the form is processed and you get your area as <type 'unicode'> then this should suffice to convert it and perform arithmetic on it.

area = form.data['area']
#area should be <type 'unicode'>
area_float = float(area)

Consider the following example

a = u'1.34'
a_float = float(a)
type(a_float)
>> <type 'float'>

However considering that a DecimalField uses Pythons decimal type internally and is different from pythons float which is used by FloatField.

Decimal Type read more here about the decimal type.

Upvotes: 7

Ranbir Singh
Ranbir Singh

Reputation: 203

you can use this with your variable containing you r data. {variable|Floatformat} I have been using this in the templates . May be that can help .:)

Upvotes: 0

stellarchariot
stellarchariot

Reputation: 2942

Form submissions are strings (excepted when files are being uploaded, I think.) In Django, the form is automatically converted to the appropriate Python type if the form is valid (how convenient!) You access the data using via cleaned_data (see Processing the data from the form.)

In this case, you might do something like:

if form.is_valid():
   # Form is valid, so do stuff with the form data
   # e.g. send email, save to DB etc.
   area = form.cleaned_data['area']
   # more code here

Upvotes: 0

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