Write a function named all-unique in Scheme that takes a list as input and returns true if each item appears once only on the list and false otherwise. You may assume the list is flat (i.e., no nested lists). Hint: Consider writing a helper function contains that returns wither a list contains a given item. For example, • (all-unique '(a b c 1 2)) should return true • (all-unique '(a b c 1 a)) should return false (all-unique '()) should return true

The following problem is coded in Python programming language. As required, write a function all_unique which returns True if all the values in the list are unique, and False if all the values are not unique.

Technically speaking, Python is a high-level, object-oriented, dynamically integrated programming language that is largely used for the creation of websites and mobile applications. Since it provides possibilities for dynamic typing and dynamic binding, it is quite appealing in the realm of rapid application development.