add class FloatValue for transparent number formatting'

git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@3312 fd906abe-77d9-0310-91a1-e0d9ade77398

commerce/common.py

@@ -116,6 +116,16 @@ class BaseObject(object):
     collection = RelationSet
 
 
+class FloatValue(float):
+
+    def __init__(self, value, decimals=2):
+        self.decimals = decimals
+
+    def __str__(self):
+        format = '%%.%if' % self.decimals
+        return (format % self).replace('.', ',')
+
+
 # utility functions
 
 def getUidForObject(obj, intIds=None):