Django Rest How I can Get all values from model Serializer each separately

I have model serializer in django rest frame work

I would like to use values from my class serializer

for example

serializer.py

    profile = ProfileSerializer()

    class Meta:
        model = User
        fields = ['username', 'email', 'profile']

@api_view(['GET', 'POST'])
def snippet_list(request):
    """
    List all code snippets, or create a new snippet.
    """
    if request.method == 'GET':
        snippets = Snippet.objects.all()
        serializer = SnippetSerializer(snippets, many=True)
        return Response(serializer.data)

    elif request.method == 'POST':
        serializer = SnippetSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
    BUT INSTEAD OF USING Response I would like to make something like
    serializerd_sername = serializer.data['username']
    serializerd_email = serializer.data['email']
    serializerd_profile = serializer.data['profile']
    and after few if else then some respond but how to get serialized data/values to use?



            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

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