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Fraction display and form fields for Django

Project description

Fraction display and form fields for Django


The full documentation is at


Install django-fractions:

pip install django-fractions

Add djfractions to settings.INSTALLED_APPS

Then use it in a project:

import djfractions

In templates:

{% load fractions %}
{% display_fraction 1.25 %}

In Forms:

from djfractions.forms import DecimalFractionField
from django import forms

class MyForm(forms.Form):
    a_fraction = DecimalFractionField()


  • Template tag for displaying float and Decimal values as fractions including mixed numbers
  • DecimalFractionField form field which handles input such as “1/4”, “1 1/2”, “1 and 1/2”, and converts to a decimal.Decimal instance


  • Add unicode_fraction template tag to display the unicode fraction entity if available
  • forms.FloatDecimalField to return a float rather than Decimal
  • forms.SplitFractionWidget for having separate numerator and denominator form fields
  • forms.SplitMixedFractionWidget for handling mixed number fractions with separate fields
  • models.DecimalBackedFractionField() to store a Decimal value but return/accept it as a fraction
  • models.FloatBackedFractionField() to store a Decimal value but return/accept it as a fraction

Cookiecutter Tools Used in Making This Package

  • cookiecutter
  • cookiecutter-djangopackage



  • add python 3.6 and django 1.11 to tox.ini - still a bit broken
  • convert to matrix for environments in .travis.yml because tox only wants to test py3.6 when installed under 3.6 but will not test 3.5 when running with python 3.6 as the base.
  • Remove invalid ROOT_URLCONF from test django config There is no for djfractions, don’t tell it to use one. Older django versions were ok with this, but 1.11 is pickier about the correctness.
  • add current changes to HISTORY.rst
  • Adjust SILENCED_SYSTEM_CHECKS setting during tests Django 1.11 is stricter about system checks and will not even run the tests where there are some errors we specifically test for due to older django versions letting you make these mistakes.
  • Added optional max_digits and decimal_places parameters to forms.DecimalFractionField so that returned Decimal objects have the desired max_digits and decimal_places when not directly tied to a models.DecimalField() on a ModelForm

1.0.0 (2016.12-31)

  • Stop subclassing Django’s DecimalField and duplicate small amounts of code as necessary for db backend compatibility. Too many things need to be handled differently. Main cause of major version bump.
  • Update forms.FractionField to skip over max_digits and decimal_places kwargs which will get passed in by models.fields.DecimalFractionField
  • Add models.fields.DecimalFractionField.formfield() so that a forms.FractionField will be used by default
  • Fix quantity_to_decimal and quantity_to_fraction to strip leading and trailing spaces before pattern matching and converting to a decimal or fraction
  • Allow for leading negative sign with forms.FractionField input values
  • Fix is_fraction() to allow leading negative sign
  • Add max_digits and decimal_places params to DecimalFractionField in test model
  • Additional test cases for models.fields.DecimalFractionField

0.4.0 (2016-08-29)

  • Added djfractions.models.DecimalFractionField which stores fractions.Fraction values as decimals in the dataase.
  • Better usage of tox to test against different Python and Django versions
  • Added testing against Django 1.10

0.3.2 (2015-08-28)

  • Fixed boolean logic for when to coerce values to thirds in in forms.DecimalFractionField and get_fraction_parts()

0.3.1 (2015-08-12)

  • HISTORY.rst typo fixes
  • pypi release version fix

0.3.0 (2015-08-12)

  • Added forms.FractionField which returns fractions.Fraction instances
  • Refactoring of common code with new forms.FractionField
  • Smarter checking for numeric types throughout the code
  • forms.DecimalFractionField.to_python() handles fractions.Fraction values now
  • Fixed bug handling negative numbers in quantity_to_decimal()
  • Added min_value and max_value to forms.DecimalFractionField
  • Made coerce_thirds, limit_denominator, and use_mixed_numbers params to DecimalFractionField proper named parameters and not just kwargs.

0.2.1 (2015-08-06)

  • Fixed typo in usage docs

0.2.0 (2015-08-06)

  • display_fraction template tag output is templated so that its formatting can be changed by users
  • Added new display_improper_fraction template tag to simplify the common case of wanting to only use improper fractions with no whole numbers
  • Added unicode_entity to template context for display_fraction and display_improper_fraction so that the html entity for common fractions may be used rather than <sup> and <sub> tags
  • Refactored lots of code out into smaller, reusable functions
  • Added a bunch of test cases

0.1.0 (2015-08-01)

  • First release on PyPI.

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