In this question, you will be writing a simple virus. A virus is a program that can $$attach itself$$ to

other programs, so that when the other program is run, the virus is also run.

Your simple virus will be a Python script that attaches itself to $($other$)$source$-$code Python scripts

$(.$py files$)$ in the same folder. Typically, this is done by searching for other $.$py files on the same

folder, opening each such file, and attaching the virus code to the script $($if it does not already

contain the virus code$).$ As a note, practical viruses often attach to machine$-$code programs, and

many attach to different macro$/$script files $($e$.$g$.$ MS Office files$).$

Note: your virus should not re$-$attach itself to a program which already contains the virus!

This question has three parts. During the first two parts we$$ll learn how to implement an aspect

of our virus functionality. Then, in part $3,$ we$$ll be ready to construct the entire virus codebase.