gistfile1.py

class AuditTrail(object):
    _borg_dict = {}

    def __init__(self, msg=None):
        self.__dict__ = self._borg_dict
        if not hasattr(self, '_log'):
            self._log = []
        if msg:
            self._log.append(msg)

    def reset(self):
        self._log = []

    def set_log(self, value):
        AuditTrail(value)

    def get_log(self):
        return self._log

    log = property(get_log, set_log)
    
    
############  
  
AuditTrail('line 1')
<__main__.AuditTrail at 0x23cd210>
    
AuditTrail().log = 'line 2'

AuditTrail().log
['line 1', 'line 2']

AuditTrail().reset()
AuditTrail().log
[]