用django创建一个名字叫book的模型，并且提供符合restful风格的api

可以按照以下步骤创建一个名为“book”的模型，并提供符合RESTful风格的API：

1. 创建Django项目并启动虚拟环境

$ mkdir myproject
$ cd myproject
$ python -m venv env
$ source env/bin/activate (Linux/MacOS)
$ env\Scripts\activate (Windows)

2. 在项目中创建一个Django应用

$ python manage.py startapp myapp

3. 在myapp/models.py文件中定义Book模型

from django.db import models

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.CharField(max_length=100)
    description = models.TextField()
    published_date = models.DateField(auto_now_add=True)

4. 创建数据库表

$ python manage.py makemigrations
$ python manage.py migrate

5. 在myapp/serializers.py文件中定义Book序列化器

from rest_framework import serializers
from .models import Book

class BookSerializer(serializers.ModelSerializer):
    class Meta:
        model = Book
        fields = ('id', 'title', 'author', 'description', 'published_date')

6. 在myapp/views.py文件中定义API视图

from rest_framework import generics
from .models import Book
from .serializers import BookSerializer

class BookList(generics.ListCreateAPIView):
    queryset = Book.objects.all()
    serializer_class = BookSerializer

class BookDetail(generics.RetrieveUpdateDestroyAPIView):
    queryset = Book.objects.all()
    serializer_class = BookSerializer

7. 在myproject/urls.py文件中添加URL路由

from django.urls import path
from myapp.views import BookList, BookDetail

urlpatterns = [
    path('books/', BookList.as_view(), name='book-list'),
    path('books/<int:pk>/', BookDetail.as_view(), name='book-detail'),
]

8. 运行Django应用并访问API

$ python manage.py runserver

现在可以使用任何HTTP客户端访问API了。例如，使用curl命令获取所有书籍：

$ curl http://127.0.0.1:8000/books/