Problem $1$

Python's os module provides a function with signature walk$($path$)$ that

generator yielding the tuple $($dirpath$,$ dirnames, filenames$)$ for each subdirectory

of the directory identified by string path, such that string dirpath is the full path

to the subdirectory, dirnames is a list of the names of the subdirectories within

dirpath, and filenames is a list of the names of non$-$directory entries of dirpath.

the walk would yield $(/$user$/$rt$/$courses$/$COMP$1210,[$ homeworks $,$ programs

$],[$ grades $]).$ Give your own implementation of such a walk function.