Python: Delete Singleton Object Instance running Flask Application -

i have application global errorhandler object. object has metaclass singleton.

here singleton:

#!/usr/bin/python class singleton(type):     def __init__(cls,name,bases,dic):         super(singleton,cls).__init__(name,bases,dic)         cls.instance=none     def __call__(cls,*args,**kw):         if cls.instance none:             cls.instance=super(singleton,cls).__call__(*args,**kw)         return cls.instance 

here errorhandler:

#!/usr/bin/python # -*- encoding: utf-8 -*-  singleton import singleton   class errorhandler(object):   __metaclass__ = singleton    _errors = []     def __init__(self):     self._jobid = ""      def seterror(self , message ):     self._errors.append( message )      def geterrors( self ):     return self._errors     def geterrorcount(self):     return len(self._errors)     def setjobid( self, jobid ):     self._jobid = jobid     def getjobid( self ):     return self._jobid      @classmethod   def clear_instance(cls):     del cls.instance     def __del__(self):       class_name = self.__class__.__name__       print class_name, "destroyed" 

my problem is, not able kill instance on destructor. webservice should restful, errorhandler still exists on every request. maybe possible tell flask run every request inside own process. tried run flask app this:

app.run(host="0.0.0.0", debug=true, threaded=true)

but won't work solve problem. workaround set error list zero, isn't threadsafe.

hope recommendations. thank in advance

greetings jörn