File Encryption and Decryption (python beginner chpt 9)

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