Write a separate program $($program$.$py$)$ to answer each question. Be sure to document your

code with a descriptive header and concise comments. It isn$$t necessary to comment every line,

particularly those lines whose purpose is obvious. Instead, use comments to outline the main

steps of your program. Use variable names that are descriptive, concise, and not excessively

verbose. Practice good style: x $=5,$ not x$=5$ and separate sections of your program by blank

lines. For your homework submission, submit these files:

sleeping.py: your program for question $1$

mortgage.py: your program for question $2$

light.py: your program for question $3$