Re: image handling

This is my model
class User(models.Model):
    first_name=models.CharField(verbose_name = "First Name *",max_length=20,blank=False)
    last_name=models.CharField(verbose_name = "Last Name *",max_length=20,blank=False)
    username=models.EmailField(verbose_name = "Email *",max_length=30,blank=False)
    password=models.CharField(verbose_name = "Password *",max_length=15,blank=False)
    dob=models.DateField(verbose_name = "DOB *" ,blank=True,null=True)
    mobileno=models.CharField(verbose_name = "Mobile No *",max_length=20,blank=False)
    houseno=models.CharField(verbose_name = "House No",max_length=10,blank=True)
    address1=models.CharField(verbose_name = "Adress1",max_length=30,blank=True)
    city=models.CharField(verbose_name = "City",max_length=20,blank=True)
    state=models.CharField(verbose_name = "State",max_length=30,blank=True)
    pincode=models.CharField(verbose_name = "Pincode",max_length=20,blank=True)
    country=models.CharField(verbose_name = "Country",max_length=30,blank=True)
    comment=models.CharField(verbose_name = "Comment",max_length=200,blank=True)
    sex=models.CharField(verbose_name = "Sex *",max_length=5,blank=False)
    image=models.FileField(verbose_name = "Image(limit 1Mb) *",blank=True,upload_to='media/')
   
    def __unicode__(self):
        return self.first_name


this is my form
class Registration(forms.ModelForm):
      password = forms.CharField(label='Password *',widget=forms.PasswordInput())
      image = forms.ImageField(label='Select a file *',help_text='max. 1 megabytes')
      class Meta:

view.py
def registration(request):
    #request.session.set_test_cookie()
    if request.method == "POST":
            regform=Registration(request.POST,request.FILES)
            if regform.is_valid():
               #item=resize_and_crop(img_path, modified_path, size, crop_type='top')
               regform.save();
               return HttpResponseRedirect('/login/')
               
            else:
                return render_to_response('registration.html',{"form":regform})
    else:
        regform=Registration()
    return render_to_response('registration.html',{"form":regform})


can anyone please tell how to handle this means how to delete the old image

Please...

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