Writing to a text file in Python from a variable, ignoring encoding problems

Writing to a file in Python is usually a simple 2-liner, which is easy to be written:

with io.open("soup.txt", "w") as file:
    file.write(soup_written)

However, problems with the encoding may cause some research needed. Concerning the encoding this is a great article from the creator of StackOverflow.com. Anyway, if the encoding is passed correctly then nothing can stop us from reading the article and writing its HTML to a file, if this is our ultimate goal:

import urllib.request
from bs4 import BeautifulSoup
import io

def main():
    resp = urllib.request.urlopen("https://www.vitoshacademy.com")
    soup = BeautifulSoup(resp,from_encoding=resp.info().get_param('charset'))
    soup_written = soup.prettify()
    print (soup_written)

    with io.open("soup.txt", "w", encoding="utf-8") as file:
        file.write(soup_written)

if __name__== "__main__":
  main()