Как использовать XmlSerializer для десериализации в существующий экземпляр?

import requests
from bs4 import BeautifulSoup

#url = 'https://www.goodreads.com/quotes'
#r = requests.get(url)
#soup = BeautifulSoup(r.content, 'html.parser')

html = """
       <div class="quoteText">&ldquo;Insanity is doing the same thing, over and over again, but expecting different results.&rdquo; <br>  &#8213;
       <span class="authorOrTitle">Narcotics Anonymous</span>
       </div>
"""

soup = BeautifulSoup(html, 'html.parser')

quotes = soup.find_all('div', {'class': 'quoteText'})

for quote in quotes:
    if quote.text is not None:
        quote_ = quote.text
        quote_data = quote_.split(" ―")
        quote_without_author = quote_data[0]
        quote_author = quote_data[1]
        print(quote_without_author.strip())
        print(quote_author.strip())

Вы можете разделить данные на -, поэтому элемент [0] - ваша цитата, [1] - ваш автор.

Выход:

“Insanity is doing the same thing, over and over again, but expecting different results.”
Narcotics Anonymous