Using Itertools 2

Write a program that takes two arguments n and k and prints all binary strings of length n that contain k zero bits, one per line. The program:

• Must be called binary.py
• Must use the itertools module
• Must provide a function called zbits(n, k) that returns a set of strings
• Must contain adequate comments and documentation

Run the following tests to ensure that the program is correct.

import binary
assert binary.zbits(4, 3) == {'0100', '0001', '0010', '1000'}
assert binary.zbits(4, 1) == {'0111', '1011', '1101', '1110'}
assert binary.zbits(5, 4) == {'00001', '00100', '01000', '10000', '00010'}

Commit the binary.py program to the repository you used for Assignment 3.