Ticket #17662: django_percentage_take_two

diff -r 385d1f81c5c7 -r 9fed087a8a42 django/contrib/humanize/templatetags/humanize.py
--- a/django/contrib/humanize/templatetags/humanize.py  Mon Feb 06 02:00:19 2012 +0000
+++ b/django/contrib/humanize/templatetags/humanize.py  Wed Feb 08 16:36:14 2012 -0500
@@ -222,3 +222,21 @@
             return ungettext(
                 u'an hour from now', u'%(count)s hours from now', count
             ) % {'count': count}
+            
+@register.filter
+def percentage(value, precision=2):
+    """
+    Returns Percentage representation of number types.
+    Takes an optional integer argument for decimal point accuracy.
+    Upon failure returns value.
+    """
+    try:
+        precision = int(precision)
+        value = float(value)*100
+    except (TypeError, ValueError):
+        return value
+    value = round(value, precision)
+    return number_format(value,decimal_pos=precision)+u'%'
+    #places = ':.{precision}%'.format(precision=precision)
+    #perc_holder =  '{' + places + '}'
+    #return perc_holder.format(value)
diff -r 385d1f81c5c7 -r 9fed087a8a42 django/contrib/humanize/tests.py
--- a/django/contrib/humanize/tests.py  Mon Feb 06 02:00:19 2012 +0000
+++ b/django/contrib/humanize/tests.py  Wed Feb 08 16:36:14 2012 -0500
@@ -109,6 +109,31 @@
                        someday_result, u"I'm not a date value", None)
         self.humanize_tester(test_list, result_list, 'naturalday')
 
+    def test_percentage(self):
+        from fractions import Fraction
+        from decimal import Decimal
+        fl_value = 1.5
+        int_value = 10
+        int_fraction = Fraction(1)/2
+        int_decimal = Decimal(1) / Decimal(2)
+        notnumber = u"I'm not a number"
+        long_float = .123456789
+
+        test_list = (fl_value, int_value, int_fraction, int_decimal, long_float,notnumber, None)
+        result_list = (u'150.00%', u'1000.00%', u'50.00%',u'50.00%',u'12.35%',
+                        notnumber, None)
+        self.humanize_tester(test_list, result_list, 'percentage')
+        result_list = (u'150.000%', u'1000.000%', u'50.000%',u'50.000%',u'12.346%',
+                        notnumber, None)
+        self.humanize_tester(test_list, result_list, 'percentage:3')
+        result_list = (fl_value, int_value, int_fraction,int_decimal,long_float,
+                        notnumber, None)
+        self.humanize_tester(test_list, result_list, "percentage:'a'")
+        with self.settings(USE_L10N=True, USE_THOUSAND_SEPARATOR=True):
+            result_list = (u'150.000%', u'1,000.000%', u'50.000%',u'50.000%',u'12.346%',
+                            notnumber, None)
+            self.humanize_tester(test_list, result_list, 'percentage:3')
+
     def test_naturalday_tz(self):
         from django.contrib.humanize.templatetags.humanize import naturalday
 
@@ -200,3 +225,5 @@
         finally:
             humanize.datetime = orig_humanize_datetime
             timesince.datetime = orig_timesince_datetime
+
+
diff -r 385d1f81c5c7 -r 9fed087a8a42 docs/ref/contrib/humanize.txt
--- a/docs/ref/contrib/humanize.txt     Mon Feb 06 02:00:19 2012 +0000
+++ b/docs/ref/contrib/humanize.txt     Wed Feb 08 16:36:14 2012 -0500
@@ -137,3 +137,32 @@
 * ``3`` becomes ``3rd``.
 
 You can pass in either an integer or a string representation of an integer.
+
+.. templatefilter:: percentage
+
+percentage
+----------
+    
+Converts a number to a percentage.
+Takes an optional integer argument for decimal point accuracy.
+
+Examples:
+
+* ``1.5`` becomes ``150.00%``.
+* ``Fraction(1)/2`` becomes ``50.00%``.
+* ``Decimal(1) / Decimal(2)`` becomes ``50.00%``.
+* ``not a number`` returns ``not a number``.
+
+You can pass in either an integer or a string representation of a number.
+**Argument:** Decimal precision can be set utilizing the precision optional argument.
+Any number type can be passed, but the function will convert to an integer,
+following Python's conversion rules.
+
+For example::
+
+    {{ value|percentage:3}}
+    
+* ``1.5`` becomes ``150.000%``.
+
+
+Default precision is set to 2.
\ No newline at end of file