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view.py

if request.method == 'POST':
        username = request.POST.get('username')
        password = request.POST.get('password')
        print "print user name ...."
        print username
        if _is_valid_email(username):
            try:
                username = User.objects.filter(email=username).values_list('username', flat=True)
            except User.DoesNotExist:
                username = None
        kwargs = {'username': username, 'password': password}
        print "print user name ....again "
        print username
        user = authenticate(**kwargs)