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DNS
A "domain name" or "hostname" is just one portion of a URL. We'll get to the other parts of a URL later.
For example, the URL https://homestarrunner.com/toons has a hostname of homestarrunner.com. The https:// and /toons portions aren't part of the domain name -> IP address mapping that we've been talking about.
Parsing a URL in Python
Python provides the urlparse function from the urllib.parse module that helps parse URLs into their components:
from urllib.parse import urlparse
parsed_url = urlparse("https://homestarrunner.com/toons")
And then you can extract just the hostname using the hostname attribute:
hostname = parsed_url.hostname
print(hostname) # homestarrunner.com
Assignment
Complete the get_domain_name_from_url function. Given a full URL, it should return the domain (or host) name.