Reference no: EM13808334

Programming Assignment: Assignment Overview

This assignment will give you some experience with dictionaries, as well as some more practice with file I/O.

Part 1: Phone keypads

The international standard letter/number mapping found on the telephone is shown below:

1

2 ABC

3 DEF

4 GHI

5 JKL

6 MNO

7 PQRS

8 TUV

9 WXYZ

0

Write a function that returns a number, given an uppercase letter, as follows:

def getNumber(uppercaseLetter):

Write a test program that prompts the user to enter a phone number as a string. The input number may contain letters. The program translates a letter (upper- or lowercase) to a digit and leaves all other characters intact.

Part 2: File Encryption and Decryption [75 points]

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, 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.