Save HTML Source Code to File

Question

How can I copy the source code of a website into a text file in Python 3?

EDIT: To clarify my issue, here's what I have:

import urllib.request

def extractHTML(url):
    f = open('temphtml.txt', 'w')
    page = urllib.request.urlopen(url)
    pagetext = page.read()
    f.write(pagetext)
    f.close()

extractHTML('http:www.google.com')

I get the following error for the f.write() function:

builtins.TypeError: must be str, not bytes

Answer 1

import urllib.request
site = urllib.request.urlopen('http://somesite.com')
data = site.read()
file = open("file.txt","wb") #open file in binary mode
file.writelines(data)
file.close()

Untested but should work.

EDIT: Updated for python3