How can I extract a text from a bytes file using python

I'm trying to code a script that gets the code of a website, saves all html in a file and after that extracts some information.

For the moment I´ve done the first part, I've saved all html into a text file.

Now I have to extract the relevant information and then save it in another text file.

But I'm having problems with encoding ...and also I don´t know very well how to extract the text in python.

Parsing a website:

import urllib.request

... file name to store the data

file_name = r'D:\scripts\datos.txt'

I want to get the text that goes after this tag and before this other one

tag_starts_with = '<p class="item-description">'
tag_ends_with = '</p>'

I get the website code and I save it into a text file

with urllib.request.urlopen("http://www.website.com/") as response, open(file_name, 'wb') as out_file:
    data = response.read() 
    out_file.write(data)

print (out_file) # First question how can I print the file? Gives me an error, I can´t print bytes

the file is now full of html text so I want to open it and process it

file_for_results = open(r'D:\scripts\datos.txt',encoding="utf8")

Extract information from the file

second question how to do a substring of the lines that contain the file and get the text between p class="item-description" and /p so i can store in file_for_results

here is the pseudocode that I'm not capable to code.

for line in file_to_filter:
    if line contains word_starts_with
      copy in file_for_results until you find </p>

Thanks in advanced for your help