Python django.forms.DecimalField() Examples

def to_python(self, value):

        comma_index = 0

        if value:

            # First we check if there is a comma inside the decimal input, and
            # store its position
            try:
                comma_index = value.index(',')
            except ValueError:
                pass

            # If we found a comma inside the input value, we replace it with a
            # regular dot
            if comma_index:
                value = value.replace(',', '.')

        # We finally pass the value (modified or not) to the standard
        # DecimalField
        return super(AllowedCommaDecimalField, self).to_python(value) 

def test_decimalfield_3(self):
        f = DecimalField(
            max_digits=4, decimal_places=2,
            max_value=decimal.Decimal('1.5'),
            min_value=decimal.Decimal('0.5')
        )
        self.assertWidgetRendersTo(
            f,
            '<input step="0.01" name="f" min="0.5" max="1.5" type="number" id="id_f" required>',
        )
        with self.assertRaisesMessage(ValidationError, "'Ensure this value is less than or equal to 1.5.'"):
            f.clean('1.6')
        with self.assertRaisesMessage(ValidationError, "'Ensure this value is greater than or equal to 0.5.'"):
            f.clean('0.4')
        self.assertEqual(f.clean('1.5'), decimal.Decimal("1.5"))
        self.assertEqual(f.clean('0.5'), decimal.Decimal("0.5"))
        self.assertEqual(f.clean('.5'), decimal.Decimal("0.5"))
        self.assertEqual(f.clean('00.50'), decimal.Decimal("0.50"))
        self.assertEqual(f.max_digits, 4)
        self.assertEqual(f.decimal_places, 2)
        self.assertEqual(f.max_value, decimal.Decimal('1.5'))
        self.assertEqual(f.min_value, decimal.Decimal('0.5')) 

def test_decimalfield_3(self):
        f = DecimalField(
            max_digits=4, decimal_places=2,
            max_value=decimal.Decimal('1.5'),
            min_value=decimal.Decimal('0.5')
        )
        self.assertWidgetRendersTo(
            f,
            '<input step="0.01" name="f" min="0.5" max="1.5" type="number" id="id_f" required>',
        )
        with self.assertRaisesMessage(ValidationError, "'Ensure this value is less than or equal to 1.5.'"):
            f.clean('1.6')
        with self.assertRaisesMessage(ValidationError, "'Ensure this value is greater than or equal to 0.5.'"):
            f.clean('0.4')
        self.assertEqual(f.clean('1.5'), decimal.Decimal("1.5"))
        self.assertEqual(f.clean('0.5'), decimal.Decimal("0.5"))
        self.assertEqual(f.clean('.5'), decimal.Decimal("0.5"))
        self.assertEqual(f.clean('00.50'), decimal.Decimal("0.50"))
        self.assertEqual(f.max_digits, 4)
        self.assertEqual(f.decimal_places, 2)
        self.assertEqual(f.max_value, decimal.Decimal('1.5'))
        self.assertEqual(f.min_value, decimal.Decimal('0.5')) 

def build_default_field(self, field, model):
        choices = getattr(field, "choices", None)
        if choices:
            return forms.ChoiceField(
                required=False,
                label=_("Default value"),
                choices=[(None, "-----------")] + list(choices),
            )
        if not (model is Member and field.name == "number"):
            if isinstance(field, models.CharField):
                return forms.CharField(required=False, label=_("Default value"))
            elif isinstance(field, models.DecimalField):
                return forms.DecimalField(
                    required=False,
                    label=_("Default value"),
                    max_digits=field.max_digits,
                    decimal_places=field.decimal_places,
                )
            elif isinstance(field, models.DateField):
                return forms.CharField(required=False, label=_("Other/fixed date")) 

def test_decimalfield_support_decimal_separator(self):
        f = DecimalField(localize=True)
        self.assertEqual(f.clean('1001,10'), decimal.Decimal("1001.10"))
        self.assertEqual(f.clean('1001.10'), decimal.Decimal("1001.10")) 

def test_decimalfield_6(self):
        f = DecimalField(max_digits=2, decimal_places=2)
        self.assertEqual(f.clean('.01'), decimal.Decimal(".01"))
        msg = "'Ensure that there are no more than 0 digits before the decimal point.'"
        with self.assertRaisesMessage(ValidationError, msg):
            f.clean('1.1') 

def validate(self, value):
        super(DecimalField, self).validate(value)
        if value in validators.EMPTY_VALUES:
            return
        # Check for NaN, Inf and -Inf values. We can't compare directly for NaN,
        # since it is never equal to itself. However, NaN is the only value that
        # isn't equal to itself, so we can use this to identify NaN
        if value != value or value == Decimal("Inf") or value == Decimal("-Inf"):
            raise ValidationError(self.error_messages['invalid'])
        sign, digittuple, exponent = value.as_tuple()
        decimals = abs(exponent)
        # digittuple doesn't include any leading zeros.
        digits = len(digittuple)
        if decimals > digits:
            # We have leading zeros up to or past the decimal point.  Count
            # everything past the decimal point as a digit.  We do not count
            # 0 before the decimal point as a digit since that would mean
            # we would not allow max_digits = decimal_places.
            digits = decimals
        whole_digits = digits - decimals

        if self.max_digits is not None and digits > self.max_digits:
            raise ValidationError(self.error_messages['max_digits'] % self.max_digits)
        if self.decimal_places is not None and decimals > self.decimal_places:
            raise ValidationError(self.error_messages['max_decimal_places'] % self.decimal_places)
        if (self.max_digits is not None and self.decimal_places is not None and
                whole_digits > (self.max_digits - self.decimal_places)):
            raise ValidationError(self.error_messages['max_whole_digits'] % (self.max_digits - self.decimal_places))

        return value 

def __init__(self, max_value=None, min_value=None, max_digits=None, decimal_places=None, *args, **kwargs):
        self.max_value, self.min_value = max_value, min_value
        self.max_digits, self.decimal_places = max_digits, decimal_places
        super(DecimalField, self).__init__(*args, **kwargs)

        if max_value is not None:
            self.validators.append(validators.MaxValueValidator(max_value))
        if min_value is not None:
            self.validators.append(validators.MinValueValidator(min_value)) 

def test_decimalfield_support_thousands_separator(self):
        f = DecimalField(localize=True)
        self.assertEqual(f.clean('1.001,10'), decimal.Decimal("1001.10"))
        msg = "'Enter a number.'"
        with self.assertRaisesMessage(ValidationError, msg):
            f.clean('1,001.1') 

def test_decimalfield_changed(self):
        f = DecimalField(max_digits=2, decimal_places=2)
        d = decimal.Decimal("0.1")
        self.assertFalse(f.has_changed(d, '0.10'))
        self.assertTrue(f.has_changed(d, '0.101'))

        with translation.override('fr'), self.settings(USE_L10N=True):
            f = DecimalField(max_digits=2, decimal_places=2, localize=True)
            localized_d = formats.localize_input(d)  # -> '0,1' in French
            self.assertFalse(f.has_changed(d, localized_d)) 

def test_decimalfield_localized(self):
        """
        A localized DecimalField's widget renders to a text input without
        number input specific attributes.
        """
        f = DecimalField(localize=True)
        self.assertWidgetRendersTo(f, '<input id="id_f" name="f" type="text" required>') 

def test_decimalfield_widget_attrs(self):
        f = DecimalField(max_digits=6, decimal_places=2)
        self.assertEqual(f.widget_attrs(Widget()), {})
        self.assertEqual(f.widget_attrs(NumberInput()), {'step': '0.01'})
        f = DecimalField(max_digits=10, decimal_places=0)
        self.assertEqual(f.widget_attrs(NumberInput()), {'step': '1'})
        f = DecimalField(max_digits=19, decimal_places=19)
        self.assertEqual(f.widget_attrs(NumberInput()), {'step': '1e-19'})
        f = DecimalField(max_digits=20)
        self.assertEqual(f.widget_attrs(NumberInput()), {'step': 'any'})
        f = DecimalField(max_digits=6, widget=NumberInput(attrs={'step': '0.01'}))
        self.assertWidgetRendersTo(f, '<input step="0.01" name="f" type="number" id="id_f" required>') 

def test_decimalfield_scientific(self):
        f = DecimalField(max_digits=4, decimal_places=2)
        with self.assertRaisesMessage(ValidationError, "Ensure that there are no more"):
            f.clean('1E+2')
        self.assertEqual(f.clean('1E+1'), decimal.Decimal('10'))
        self.assertEqual(f.clean('1E-1'), decimal.Decimal('0.1'))
        self.assertEqual(f.clean('0.546e+2'), decimal.Decimal('54.6')) 

def __init__(self, verbose_name=None, name=None, max_digits=None,
                 decimal_places=None, **kwargs):
        self.max_digits, self.decimal_places = max_digits, decimal_places
        super(DecimalField, self).__init__(verbose_name, name, **kwargs) 

def test_decimalfield_1(self):
        f = DecimalField(max_digits=4, decimal_places=2)
        self.assertWidgetRendersTo(f, '<input id="id_f" step="0.01" type="number" name="f" required>')
        with self.assertRaisesMessage(ValidationError, "'This field is required.'"):
            f.clean('')
        with self.assertRaisesMessage(ValidationError, "'This field is required.'"):
            f.clean(None)
        self.assertEqual(f.clean('1'), decimal.Decimal("1"))
        self.assertIsInstance(f.clean('1'), decimal.Decimal)
        self.assertEqual(f.clean('23'), decimal.Decimal("23"))
        self.assertEqual(f.clean('3.14'), decimal.Decimal("3.14"))
        self.assertEqual(f.clean(3.14), decimal.Decimal("3.14"))
        self.assertEqual(f.clean(decimal.Decimal('3.14')), decimal.Decimal("3.14"))
        self.assertEqual(f.clean('1.0 '), decimal.Decimal("1.0"))
        self.assertEqual(f.clean(' 1.0'), decimal.Decimal("1.0"))
        self.assertEqual(f.clean(' 1.0 '), decimal.Decimal("1.0"))
        with self.assertRaisesMessage(ValidationError, "'Ensure that there are no more than 4 digits in total.'"):
            f.clean('123.45')
        with self.assertRaisesMessage(ValidationError, "'Ensure that there are no more than 2 decimal places.'"):
            f.clean('1.234')
        msg = "'Ensure that there are no more than 2 digits before the decimal point.'"
        with self.assertRaisesMessage(ValidationError, msg):
            f.clean('123.4')
        self.assertEqual(f.clean('-12.34'), decimal.Decimal("-12.34"))
        with self.assertRaisesMessage(ValidationError, "'Ensure that there are no more than 4 digits in total.'"):
            f.clean('-123.45')
        self.assertEqual(f.clean('-.12'), decimal.Decimal("-0.12"))
        self.assertEqual(f.clean('-00.12'), decimal.Decimal("-0.12"))
        self.assertEqual(f.clean('-000.12'), decimal.Decimal("-0.12"))
        with self.assertRaisesMessage(ValidationError, "'Ensure that there are no more than 2 decimal places.'"):
            f.clean('-000.123')
        with self.assertRaisesMessage(ValidationError, "'Ensure that there are no more than 4 digits in total.'"):
            f.clean('-000.12345')
        self.assertEqual(f.max_digits, 4)
        self.assertEqual(f.decimal_places, 2)
        self.assertIsNone(f.max_value)
        self.assertIsNone(f.min_value) 

def test_enter_a_number_error(self):
        f = DecimalField(max_digits=4, decimal_places=2)
        values = (
            '-NaN', 'NaN', '+NaN',
            '-sNaN', 'sNaN', '+sNaN',
            '-Inf', 'Inf', '+Inf',
            '-Infinity', 'Infinity', '+Infinity',
            'a', 'łąść', '1.0a', '--0.12',
        )
        for value in values:
            with self.subTest(value=value), self.assertRaisesMessage(ValidationError, "'Enter a number.'"):
                f.clean(value) 

def test_decimalfield_support_thousands_separator(self):
        f = DecimalField(localize=True)
        self.assertEqual(f.clean('1.001,10'), decimal.Decimal("1001.10"))
        msg = "'Enter a number.'"
        with self.assertRaisesMessage(ValidationError, msg):
            f.clean('1,001.1') 

def test_decimalfield_widget_attrs(self):
        f = DecimalField(max_digits=6, decimal_places=2)
        self.assertEqual(f.widget_attrs(Widget()), {})
        self.assertEqual(f.widget_attrs(NumberInput()), {'step': '0.01'})
        f = DecimalField(max_digits=10, decimal_places=0)
        self.assertEqual(f.widget_attrs(NumberInput()), {'step': '1'})
        f = DecimalField(max_digits=19, decimal_places=19)
        self.assertEqual(f.widget_attrs(NumberInput()), {'step': '1e-19'})
        f = DecimalField(max_digits=20)
        self.assertEqual(f.widget_attrs(NumberInput()), {'step': 'any'})
        f = DecimalField(max_digits=6, widget=NumberInput(attrs={'step': '0.01'}))
        self.assertWidgetRendersTo(f, '<input step="0.01" name="f" type="number" id="id_f" required>') 

def test_decimalfield_scientific(self):
        f = DecimalField(max_digits=4, decimal_places=2)
        with self.assertRaisesMessage(ValidationError, "Ensure that there are no more"):
            f.clean('1E+2')
        self.assertEqual(f.clean('1E+1'), decimal.Decimal('10'))
        self.assertEqual(f.clean('1E-1'), decimal.Decimal('0.1'))
        self.assertEqual(f.clean('0.546e+2'), decimal.Decimal('54.6')) 

def test_decimalfield_6(self):
        f = DecimalField(max_digits=2, decimal_places=2)
        self.assertEqual(f.clean('.01'), decimal.Decimal(".01"))
        msg = "'Ensure that there are no more than 0 digits before the decimal point.'"
        with self.assertRaisesMessage(ValidationError, msg):
            f.clean('1.1') 

def test_decimalfield_4(self):
        f = DecimalField(decimal_places=2)
        with self.assertRaisesMessage(ValidationError, "'Ensure that there are no more than 2 decimal places.'"):
            f.clean('0.00000001') 

def test_decimalfield_2(self):
        f = DecimalField(max_digits=4, decimal_places=2, required=False)
        self.assertIsNone(f.clean(''))
        self.assertIsNone(f.clean(None))
        self.assertEqual(f.clean('1'), decimal.Decimal("1"))
        self.assertEqual(f.max_digits, 4)
        self.assertEqual(f.decimal_places, 2)
        self.assertIsNone(f.max_value)
        self.assertIsNone(f.min_value) 

def test_enter_a_number_error(self):
        f = DecimalField(max_digits=4, decimal_places=2)
        values = (
            '-NaN', 'NaN', '+NaN',
            '-sNaN', 'sNaN', '+sNaN',
            '-Inf', 'Inf', '+Inf',
            '-Infinity', 'Infinity', '+Infinity',
            'a', 'łąść', '1.0a', '--0.12',
        )
        for value in values:
            with self.subTest(value=value), self.assertRaisesMessage(ValidationError, "'Enter a number.'"):
                f.clean(value) 

def test_decimalfield_1(self):
        f = DecimalField(max_digits=4, decimal_places=2)
        self.assertWidgetRendersTo(f, '<input id="id_f" step="0.01" type="number" name="f" required>')
        with self.assertRaisesMessage(ValidationError, "'This field is required.'"):
            f.clean('')
        with self.assertRaisesMessage(ValidationError, "'This field is required.'"):
            f.clean(None)
        self.assertEqual(f.clean('1'), decimal.Decimal("1"))
        self.assertIsInstance(f.clean('1'), decimal.Decimal)
        self.assertEqual(f.clean('23'), decimal.Decimal("23"))
        self.assertEqual(f.clean('3.14'), decimal.Decimal("3.14"))
        self.assertEqual(f.clean(3.14), decimal.Decimal("3.14"))
        self.assertEqual(f.clean(decimal.Decimal('3.14')), decimal.Decimal("3.14"))
        self.assertEqual(f.clean('1.0 '), decimal.Decimal("1.0"))
        self.assertEqual(f.clean(' 1.0'), decimal.Decimal("1.0"))
        self.assertEqual(f.clean(' 1.0 '), decimal.Decimal("1.0"))
        with self.assertRaisesMessage(ValidationError, "'Ensure that there are no more than 4 digits in total.'"):
            f.clean('123.45')
        with self.assertRaisesMessage(ValidationError, "'Ensure that there are no more than 2 decimal places.'"):
            f.clean('1.234')
        msg = "'Ensure that there are no more than 2 digits before the decimal point.'"
        with self.assertRaisesMessage(ValidationError, msg):
            f.clean('123.4')
        self.assertEqual(f.clean('-12.34'), decimal.Decimal("-12.34"))
        with self.assertRaisesMessage(ValidationError, "'Ensure that there are no more than 4 digits in total.'"):
            f.clean('-123.45')
        self.assertEqual(f.clean('-.12'), decimal.Decimal("-0.12"))
        self.assertEqual(f.clean('-00.12'), decimal.Decimal("-0.12"))
        self.assertEqual(f.clean('-000.12'), decimal.Decimal("-0.12"))
        with self.assertRaisesMessage(ValidationError, "'Ensure that there are no more than 2 decimal places.'"):
            f.clean('-000.123')
        with self.assertRaisesMessage(ValidationError, "'Ensure that there are no more than 4 digits in total.'"):
            f.clean('-000.12345')
        self.assertEqual(f.max_digits, 4)
        self.assertEqual(f.decimal_places, 2)
        self.assertIsNone(f.max_value)
        self.assertIsNone(f.min_value) 

def __init__(self, fields=None, *args, **kwargs):
        if fields is None:
            fields = (
                forms.DecimalField(),
                forms.DecimalField())
        super(RangeField, self).__init__(fields, *args, **kwargs) 

def test_should_decimal_convert_float():
    assert_conversion(forms.DecimalField, Float) 

def formfield(self, **kwargs):
        defaults = {
            'max_digits': self.max_digits,
            'decimal_places': self.decimal_places,
            'form_class': forms.DecimalField,
        }
        defaults.update(kwargs)
        return super(DecimalField, self).formfield(**defaults) 

def get_internal_type(self):
        return "DecimalField" 

def deconstruct(self):
        name, path, args, kwargs = super(DecimalField, self).deconstruct()
        if self.max_digits is not None:
            kwargs['max_digits'] = self.max_digits
        if self.decimal_places is not None:
            kwargs['decimal_places'] = self.decimal_places
        return name, path, args, kwargs 

def validators(self):
        return super(DecimalField, self).validators + [
            validators.DecimalValidator(self.max_digits, self.decimal_places)
        ]