django ModelForm: error name 'self' is not defined

hello all, 

I am trying to make a registration form using User model so  i am using ModelForm 

as I am using bootstrap template i need to add some atribute like class placeholder 

so i am using widget, am facing a problem , i searchd a lot but unable to find the solution 

please help 

my code is under 

####################################################################

error :- name 'self' is not defined

on borwser 

######################################################################3

forms.py 

class RegistrationForm(ModelForm):

class Meta:

model = User

fields = [ 'username', 'password', 'email' ]

def __init__(self, *args, **kwargs): 

   super(RegistrationForm, self).__init__(*args, **kwargs)

   self.fields['username'].widget = forms.TextInput(attrs={"placeholder" : "First Name", 

            "name" : "first_name"})

   self.fields['email'].widget = forms.TextInput(attrs={"placeholder" : "Email Address", 

            "name" : "email"})

        self.fields['password'].widget = forms.PasswordInput(attrs={

        "placeholder" : "Password", "name" : "password", "class" : "form-control input-sm"})

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