need to update a listview

gistfile1.txt

here is the adapter:

class studentDetailsAdapter(ListAdapter):

        def __init__(self, **kwargs):
            super(studentDetailsAdapter, self).__init__(**kwargs)

            self.args_converter= lambda row_index, rec: {'text': rec,
                                                        'size_hint_y': None,
                                                        'text_size': (200, 30),
                                                        'deselected_color': [1,1,1,1],
                                                        'selected_color': [0,0,1,1],
                                                        'font_size': 20,
                                                        'height': 50}
here is the instance and the listview class:

SDA= studentDetailsAdapter(data= ['testing'], cls= ListItemLabel)

class StudentDetailList(ListView):
    global SDA
    def __init__(self, **kwargs):
        super(StudentDetailList, self).__init__(**kwargs)
        self.adapter= SDA

and here is the callback:

def callback(instance):
    global SDA
    try:
        detailsList= StudentDetail(lastname(instance.text), firstname(instance.text))
        SDA= studentDetailsAdapter(data= formatlist(detailsList), cls= ListItemLabel)
        #details.adapter= SDA
        print 'SDA data is', SDA.data
        StudentPhoto.source= photoName(detailsList[6])
        StudentPhoto.allow_stretch= True
        StudentPhoto.scale = 2
        #medicalinfo.text= detailsList[7]
        #emergencyContact.text= '[b]Emergency Contact: \n[/b]' + '[b]' + detailsList[3] + '[/b]'
    except (IndexError, AttributeError):
        StudentPhoto.source= '/home/clyde/kids/765-default-avatar.png'
        SDA.data= []
       

the print statement works and pass the label text from the button properly