I don't understand how I am suppose to create the needed step to use the dictionary "code" to encrypt the requested message my teacher gave us for this assignment.

Assignment: Write a program that uses a dictionary to assign "codes" to each letter of the alphabet. For example: codes = { 'A' : '%', 'a' : '9', 'B' : '@', etc....} Using this example, the letter A would be assigned the symbol %, the letter 'a' would be assigned the number 9 and so forth. The program should open a specified text file, read its contents, and then use the dictionary to write an encrypted version of the file's contents to a second file. Each character in the second file should contain the code for the corresponding character in the first file. Write a second program that opens an encrypted file and displays its decrypted contents on the screen.