Fixed #2365, #3324 -- Renamed FloatField to DecimalField and changed the code

to return Decimal instances in Python for this field. Backwards incompatible
change.

Added a real FloatField (stores floats in the database) and support for
FloatField and DecimalField in newforms (analogous to IntegerField).

Included decimal.py module (as django.utils._decimal) from Python 2.4. This is
license compatible with Django and included for Python 2.3 compatibility only.

Large portions of this work are based on patches from Andy Durdin and Jorge
Gajon.



git-svn-id: http://code.djangoproject.com/svn/django/trunk@5302 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/forms/tests.py

@@ -7,6 +7,10 @@ form_tests = r"""
 >>> import datetime
 >>> import time
 >>> import re
+>>> try:
+...     from decimal import Decimal
+... except ImportError:
+...     from django.utils._decimal import Decimal
 
 ###########
 # Widgets #
@@ -1046,6 +1050,133 @@ Traceback (most recent call last):
 ...
 ValidationError: [u'Ensure this value is less than or equal to 20.']
 
+# FloatField ##################################################################
+
+>>> f = FloatField()
+>>> f.clean('')
+Traceback (most recent call last):
+...
+ValidationError: [u'This field is required.']
+>>> f.clean(None)
+Traceback (most recent call last):
+...
+ValidationError: [u'This field is required.']
+>>> f.clean('1')
+1.0
+>>> isinstance(f.clean('1'), float)
+True
+>>> f.clean('23')
+23.0
+>>> f.clean('3.14')
+3.1400000000000001
+>>> f.clean('a')
+Traceback (most recent call last):
+...
+ValidationError: [u'Enter a number.']
+>>> f.clean('1.0 ')
+1.0
+>>> f.clean(' 1.0')
+1.0
+>>> f.clean(' 1.0 ')
+1.0
+>>> f.clean('1.0a')
+Traceback (most recent call last):
+...
+ValidationError: [u'Enter a number.']
+
+>>> f = FloatField(required=False)
+>>> f.clean('')
+
+>>> f.clean(None)
+
+>>> f.clean('1')
+1.0
+
+FloatField accepts min_value and max_value just like IntegerField:
+>>> f = FloatField(max_value=1.5, min_value=0.5)
+
+>>> f.clean('1.6')
+Traceback (most recent call last):
+...
+ValidationError: [u'Ensure this value is less than or equal to 1.5.']
+>>> f.clean('0.4')
+Traceback (most recent call last):
+...
+ValidationError: [u'Ensure this value is greater than or equal to 0.5.']
+>>> f.clean('1.5')
+1.5
+>>> f.clean('0.5')
+0.5
+
+# DecimalField ################################################################
+
+>>> f = DecimalField(max_digits=4, decimal_places=2)
+>>> f.clean('')
+Traceback (most recent call last):
+...
+ValidationError: [u'This field is required.']
+>>> f.clean(None)
+Traceback (most recent call last):
+...
+ValidationError: [u'This field is required.']
+>>> f.clean('1')
+Decimal("1")
+>>> isinstance(f.clean('1'), Decimal)
+True
+>>> f.clean('23')
+Decimal("23")
+>>> f.clean('3.14')
+Decimal("3.14")
+>>> f.clean('a')
+Traceback (most recent call last):
+...
+ValidationError: [u'Enter a number.']
+>>> f.clean('1.0 ')
+Decimal("1.0")
+>>> f.clean(' 1.0')
+Decimal("1.0")
+>>> f.clean(' 1.0 ')
+Decimal("1.0")
+>>> f.clean('1.0a')
+Traceback (most recent call last):
+...
+ValidationError: [u'Enter a number.']
+>>> f.clean('123.45')
+Traceback (most recent call last):
+...
+ValidationError: [u'Ensure that there are no more than 4 digits in total.']
+>>> f.clean('1.234')
+Traceback (most recent call last):
+...
+ValidationError: [u'Ensure that there are no more than 2 decimal places.']
+>>> f.clean('123.4')
+Traceback (most recent call last):
+...
+ValidationError: [u'Ensure that there are no more than 2 digits before the decimal point.']
+>>> f = DecimalField(max_digits=4, decimal_places=2, required=False)
+>>> f.clean('')
+
+>>> f.clean(None)
+
+>>> f.clean('1')
+Decimal("1")
+
+DecimalField accepts min_value and max_value just like IntegerField:
+>>> f = DecimalField(max_digits=4, decimal_places=2, max_value=Decimal('1.5'), min_value=Decimal('0.5'))
+
+>>> f.clean('1.6')
+Traceback (most recent call last):
+...
+ValidationError: [u'Ensure this value is less than or equal to 1.5.']
+>>> f.clean('0.4')
+Traceback (most recent call last):
+...
+ValidationError: [u'Ensure this value is greater than or equal to 0.5.']
+>>> f.clean('1.5')
+Decimal("1.5")
+>>> f.clean('0.5')
+Decimal("0.5")
+
 # DateField ###################################################################
 
 >>> import datetime