给定GoogleBooks应用编程接口的模型类

import json

class GoogleBook:
    def __init__(self, json_data):
        self.id = json_data.get('id', '')
        self.title = json_data.get('title', '')
        self.authors = json_data.get('authors', [])
        self.published_date = json_data.get('publishedDate', '')
        self.publisher = json_data.get('publisher', '')
        self.description = json_data.get('description', '')
        self.page_count = json_data.get('pageCount', 0)
        self.image_links = json_data.get('imageLinks', {})
        self.language = json_data.get('language', '')

    def get_image_url(self, size='thumbnail'):
        if 'imageLinks' in self.image_links and size in self.image_links:
            return self.image_links[size]
        return None

    def to_dict(self):
        return {
            'id': self.id,
            'title': self.title,
            'authors': self.authors,
            'published_date': self.published_date,
            'publisher': self.publisher,
            'description': self.description,
            'page_count': self.page_count,
            'image_url': self.get_image_url(),
            'language': self.language
        }

    @classmethod
    def from_json(cls, json_string):
        json_data = json.loads(json_string)
        return cls(json_data)

    def __str__(self):
        return f"{self.title} by {', '.join(self.authors)} ({self.published_date})"

import requests

def fetch_book_info(isbn):
    url = f"https://www.googleapis.com/books/v1/volumes?q=isbn:{isbn}"
    response = requests.get(url)
    if response.status_code == 200:
        data = response.json()
        if 'items' in data and len(data['items']) > 0:
            book_data = data['items'][0]['volumeInfo']
            book = GoogleBook(book_data)
            print(book)
            return book
        else:
            print("No books found.")
    else:
        print("Failed to fetch book info.")

# 示例：通过 ISBN 获取书籍信息
fetch_book_info('9780132350884')