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POPython : Object is not avaialbe on different file
 

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  1. POPython : Object is not avaialbe on different file
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    <p>I have created a singlton Here is the class description.<br> allsms.py</p> <pre><code>from DB.models import ApiKey,ServiceProvider from DB.messagenet import MessageNet class SMSMgr( object ): _instance = None _allsp = [] def __init__(self): pass def __new__(cls, *args, **kwargs): if not cls._instance : cls._instance = super(SMSMgr, cls).__new__( cls, *args, **kwargs) return cls._instance def loadsettings(self): get_all_sp = ServiceProvider.objects.filter(status = False) for obj in get_all_sp: cla = obj.class_Name a=globals()[str(obj.class_Name)](obj.userName,obj.password,obj.sendingurl) self._allsp.append(a) #print self._allsp def reload(self): self._allsp = [] get_all_sp = ServiceProvider.objects.filter(status = False) for obj in get_all_sp: cla = obj.class_Name a=globals()[str(obj.class_Name)](obj.userName,obj.password,obj.sendingurl) self._allsp.append(a) def send(self): print "+++++++++++++++++++== Global send " if __name__ == "__main__": b = SMSMgr() b.loadsettings() </code></pre> <p>Now in <code>test.py</code> file of the same directory I am trying to use the singleton object which stored in the <code>_allsp</code> variable like.</p> <pre><code>from SMShandler.allsms import SMSMgr b = SMSMgr() #b.loadsettings() print b._allsp </code></pre> <p>This is printing empty list. But when I am doing like this:</p> <pre><code>b = SMSMgr() b.loadsettings() print b._allsp </code></pre> <p>it is printing the list of objects .</p> <p>My question is, if the above design is singlton then why <code>print b._allsp</code> is printing empty list in <code>test.py</code>? I am already loading <code>loadsettings</code> in the <code>allsms.py</code> file . </p>
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    1. USJavier Brooklyn
    1. USmasterofdestiny
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    1. COJust a sidenote: I think it is a bit problematic to use this approach of creating a singleton. If one does not know the source code of the SMSMgr class he cannot anticipate the special behavior of the constructor. It is very confusing that two separate calls of SMSMgr() actually produce the same instance with the same attributes. From zen: 'Explicit is better than implicit.'
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      1. POPython : Object is not avaialbe on different file
      1. USOle
 

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