class Auth_form(forms.Form):
	FirstName = forms.CharField()
	LastName = forms.CharField()
	Mail = forms.EmailField(required=False)
	Year = forms.CharField()
	#date = forms.DateField()
	def clean_spec(self):
		try :
			self.cleaned_data
			Y = int(data['Year'])
			Person.objects.get(first_name = data['FirstName'],last_name=data['LastName'],year=Y,contact=data['Mail'])
			return True	
		except: return False

def contact(request):
    if request.method == 'POST':
        form =  Auth_form(request.POST)
        if form.is_valid():
            if form.clean_spec():
				return change_settings(request,True)
    else:
        form =  Auth_form()
    return render_to_response('contact_form.html', {'form': form})

unindent does not match any outer indentation level (views.py, line 82)

def contact(request):
    if request.method == 'POST':
        form =  Auth_form(request.POST)
        if form.is_valid():
            if form.clean_spec():
				return change_settings(request,True)
			else:
				return HttpResponseRedirect('/')
    else:
        form =  Auth_form()
    return render_to_response('contact_form.html', {'form': form})