How to develop a Python tool for creating and managing online surveys and quizzes?

Here's a simplified way of how you could approach developing a Python tool for creating and managing online surveys and quizzes. This example will utilize Django web development framework. Please note, this is a complex task that requires a good understanding of Python and Django.

This guide assumes that Python and Django are already installed on your computer, and you are familiar with their basic usage.

Step 1: Set up the Django project
Run the following command in your terminal to create a new Django project named "quiz_project":

   django-admin startproject quiz_project

Step 2: Set up a new App
Navigate into your new project and start a new app, in this case "quiz_app":

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   cd quiz_project
   python manage.py startapp quiz_app

Step 3: Define your Models</h1><p>
The next step is to define your models. open 'models.py' in 'quiz_app' and set up the following models:

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   class Quiz(models.Model):
       name = models.CharField(max_length=200)

   class Question(models.Model):
       quiz = models.ForeignKey(Quiz, on_delete=models.CASCADE)
       text = models.TextField()

   class Answer(models.Model):
       question = models.ForeignKey(Question, on_delete=models.CASCADE)
       text = models.CharField(max_length=200)
       is_correct = models.BooleanField(default=False)

These models create a simple structure of a Quiz that contains many Questions, and each Question has many Answers.

Step 4: Create Serializer Classes
In 'quiz_app', create a new file named 'serializers.py'. Here we will define the serializers for our models.

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   from rest_framework import serializers
   from .models import Quiz, Question, Answer

   class AnswerSerializer(serializers.ModelSerializer):
       class Meta:
           model = Answer
           fields = '__all__'

   class QuestionSerializer(serializers.ModelSerializer):
       answers = AnswerSerializer(many=True, read_only=True)

       class Meta:
           model = Question
           fields = '__all__'

   class QuizSerializer(serializers.ModelSerializer):
       questions = QuestionSerializer(many=True, read_only=True)

       class Meta:
           model = Quiz
           fields = '__all__'

This sets up serializers which will convert model instances into JSON.

Step 5: Define APIs
Let's define the APIs. Create a file named 'api.py' inside 'quiz_app' and place the following code:

   from rest_framework import viewsets
   from .models import Quiz, Question, Answer
   from .serializers import QuizSerializer, QuestionSerializer, AnswerSerializer

   class QuizViewSet(viewsets.ModelViewSet):
       queryset = Quiz.objects.all()
       serializer_class = QuizSerializer

   class QuestionViewSet(viewsets.ModelViewSet):
       queryset = Question.objects.all()
       serializer_class = QuestionSerializer

   class AnswerViewSet(viewsets.ModelViewSet):
       queryset = Answer.objects.all()
       serializer_class = AnswerSerializer

This code sets up viewsets that will handle HTTP requests for our models.

Step 6: Define Default Routes

Create a 'urls.py' file in 'quiz_app' and set the default routes for your API:

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   from django.urls import path, include
   from rest_framework.routers import DefaultRouter
   from .api import QuizViewSet, QuestionViewSet, AnswerViewSet

   router = DefaultRouter()
   router.register('quiz', QuizViewSet, basename='quiz')
   router.register('questions', QuestionViewSet, basename='questions')
   router.register('answers', AnswerViewSet, basename='answers')

   urlpatterns = [
       path('', include(router.urls))
   ]
Step 7: Run and Test the server

Finally, we can run the server with:

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   python manage.py runserver

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And open http://127.0.0.1:8000/ in your web browser. You can use a tool such as Postman to test the APIs.

Note: This is just a simple and basic setup with no user management and no restrictions on who can create or delete quizzes, questions or answers. Depending on your needs, you might want to expand on this example, add validation, user restrictions and more.