File Encryption and Decryption

Write a program that uses a dictionary to assign "codes" to each letter of the alphabet. For example:

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 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.