PYTHON Please write a function and create a dictionary. Upvote for Quick response. Thank you.

Write a function that accepts a dictionary whose keys and values are strings as its parameter and returns True if no two keys or more map to the same value, otherwise, return false. Create a dictionary in your program and test the function. Sampe output for dictionary: {' Marty': '206-9024', 'Hawking': '123-4567','Smith': '949-0504', 'Newton': '123-4567"} two or more keys map to the same value sample output for dictionary: {"Marty': '206-9024', 'Hawking': '555-1234','Smith': '949-0504', 'Newton': '123-4567'} no two keys map to the same value