Problem:The government now requires that DNSs should now maintain a secret blacklist of IPAs that must not be returned, even if the domain name exists.

Without changing your DNS class from problem 1, define a new class that extends your old class, adding:

• a method for adding an IPA to the secret blacklist; and
• a private attribute for the blacklist.

Hint: it may be called a blacklist, but is a Python list the most efficient data structure to use here?

You must also override the lookup method so that it returnsNonefor blacklisted IPA, even if they do exist.

Design a test program that allows the user to test the new class.

In this case if the user input is "b" they are able to black list. With a confirmation message saying "domain, ipa, 'is now blacklisted'"