Please comment on your code so i can understand what you did and learn. Thank you

Given a dictionary listing student names and their grades in a given class write a python program that counts how many times each grade appears in the dictionary. Test your program with the following dictionary: Csc4340 = {"tim I, 'B', 'richard ': 'osh E', 'suincy': 'A', 'Sherry ': 'F', 'latasha ': 'A','laurence ': 'B', 'Omar ': 'D', 'chanel': 'A', 'tasih':DL C. AdministratorCommand Prompt Mirensoft Windows (Uersion 6126a1 Copyright (c) 2009 Microsoft Corporation . All rights reserved . HEN>c: C:\>d python34 C:\Python 34python lab15. py CSC 1315: 'chanel': 'A', 'latasha ': 'A'tim ': 'B', 'josh: 'F', 'omar': 'D' , 'quincy 'E 'A', 'richard': 'B', 'sherry': 'F'," laurence : 'B', 'tyasiha ': 'D' k'B': 3. 'F ': 2. 'A': 3. 'D': 2 C:\Python34