Python 3: Develop a crawler that collects the email addresses in the visited web pages. You can use function emails() from Problem 11.22 (below) to find email addresses in a web page. Design it so that the crawler only follows links hosted on the same host as the starting web page.

The emails() function mentioned above is this:

def emails(page):

email_addresses = re.findall(r'[\w\.-]+@[\w\.-]+', page)

print(email_addresses)