问从DRF get-token api获取令牌

EN

from rest_framework import viewsets
from rest_framework import serializers

class SignupSerializer(serializers.Serializer):
    email = serializers.EmailField(required=True)
    password = serializers.CharField(required=True, write_only=True)

    def validate_email(self, val):
        try:
            User.objects.get(username=val)
            raise serializers.ValidationError("Email-ID already Exist")
        except User.DoesNotExist:
            return val

class SignupView(viewsets.ModelViewSet):

    serializer_class = SignupSerializer

    def create(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        data = serializer.data

        email = data.get('email')
        password = data.get('password')

        u = User(email=email, username=email)
        u.set_password(password)
        u.save()

        data = {
            'message': 'Successfully Created!',
            'data': {'id': u.id, 'email': email},
        }
        return Response(data)

from rest_framework.authtoken import views
urlpatterns = [
    url(r'^api-token-auth/', views.obtain_auth_token),
]

{
  "non_field_errors": [
    "Unable to log in with provided credentials."
  ]
}