Psycopg2 TypeError：在没有ORM的字符串格式化期间，并非所有参数都已转换

Question

尝试一个简单的脚本，该脚本将来自beautifulsoup的数据保存在PostgreSQL数据库中，并得到一个错误。

from urllib.request import urlopen
from bs4 import BeautifulSoup

url = 'https://stackoverflow.com/questions/1125968/how-do-i-force-git-pull-to-overwrite-local-files'
page = urlopen(url)
soup = BeautifulSoup(page, 'html.parser')

In [38]: type(soup)                                                                                 
Out[38]: bs4.BeautifulSoup

In [39]: type(soup.text)                                                                            
Out[39]: str

con = psycopg2.connect("host='localhost' dbname='google_crawl' user='crawler' password='postgres'")
cur = con.cursor()
cur.execute("CREATE TABLE Products(Id INTEGER PRIMARY KEY, website VARCHAR(20), html_code VARCHAR)")

In [36]: cur.execute("INSERT INTO Products (Id, website, html_code) VALUES(%s, %s)", ('1', 'test.com
    ...: ', str(soup.text)))                                                                        
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-36-4e9b298d0ce2> in <module>
----> 1 cur.execute("INSERT INTO Products (Id, website, html_code) VALUES(%s, %s)", ('1', 'test.com', str(soup.text)))

TypeError: not all arguments converted during string formatting

错误表明它无法将数据之一转换为字符串，但是我不能特别说明为什么甚至将伪文本而不是soup都返回相同的错误。