cheimplement a function f1 such that the call sorted(xs, key=f1) with a list of integers returns a copy of xs sorted in reverse order (from larger to small)\ code example

Example: python sort comparator

sorted("This is a test string from Andrew".split(), key=str.lower)
['a', 'Andrew', 'from', 'is', 'string', 'test', 'This']

sorted(student_tuples, key=lambda student: student[2])   # sort by age
[('dave', 'B', 10), ('jane', 'B', 12), ('john', 'A', 15)]