#!/usr/bin/env python
# encoding: utf-8


def save_desc(self, desc, *args, **kwargs):
   self.desc = desc
   self.__init_orig__(*args, **kwargs)

class DescMetaclass(type):                                                             
   def __new__(cls, name, bases, attrs):
      if not name == 'Field':
         attrs['__init_orig__'] = attrs['__init__']
         attrs['__init__'] = save_desc
      return type.__new__(cls, name, bases, attrs)   
class Field(object):
   
   __metaclass__ = DescMetaclass

   def __init__(self, widget=None, required=True):
      self.d={}
      self.d['widget'] = widget
      self.d['required'] = required
      
   def render(self):
      print self.desc
      print self.d


class RegExpField(Field):
   
   def __init__(self, widget=None, required=True, regexp=None, caseSensivity=False):

      Field.__init__(self, widget=widget, required=required)
      self.d['regexp'] = regexp
      self.d['caseSensivity'] = caseSensivity
   

def main():
    
    t=RegExpField('aaaa', regexp='.+', widget=123)
    t.render()


if __name__ == '__main__':
    main()