IN PYTHON PLEASE.

Skills Needed to complete this Lab . Index, slice strings Iterate over strings use string methods Loops Variables Caesar Cipher The Caesar Cipher is an encryption/decryption method that shifts the alphabet. For instance, if you have a cipher that shifts by 1, A would become B, B would become C, Z would wrap and become A. To decrypt that cipher you simply shift by -1. It is a very simple cipher that is easily broken. http://en.wikipedia.org/wiki/Caesar cipher We need you to write a utility that Encodes and Decodes a Cipher. o o The Rules. The main program loop should ask the user if they want to o 1. Encode a string 2. Decode a string Q. Quit If the user chooses anything other than 1, 2, or Q, they get an error and it tries again. If they want to encrypt a word or sentence, ask for the phrase and then ask for the #to shift by, once you encrypt the string, output the result to the user. If they want to decrypt a word or sentence, ask for the string and the # of to shift by. Then display the decrypted string to the user. Go back to the main menu until they select quit. . . . . Program Requirements: Development Notes: The string module has some useful constants. Strings of only upper case characters, lower case characters, digits. >>> import string >>> string: ascii uppercase "ABCDEFGHIJKLMNOPQRSTUVWXYZ" These . Strings have two methods that could be useful. .lower and .upper(). methods return a string that is lowercased or upper cased respectively. abcLower "ABC"lower() # abcLower is "abe" abcUpper = "abs". upper + abeUpper is "ABC" The membership operator in can be useful as well, but is not required. Strings have a method find() that will return a -1 if the substring or character provided is not in the string. >>> "ABC".find("Z") -1 >>> "ABC". find ("A") 0 >>> String indexing will probably be useful here as well. You can use the Python chri) and ord() function get the numeric value of each character and change it back to a character. >>> sh = "A" >>> shexalue = ord(sb) A >>> chevalue 65 >>> Cheges = chrichexalue + 2) >>> shades >>> You must use functional decomposition to get full credit for this program. Example MAIN MENU: 1) Encode a string 2) Decode a string Q Quit Enter your selection ==> 1 Enter (brief) text to encrypt: hello world Enter the number to shift letters by: 3 Encrypted: KHOOR ZRUOG MAIN MENU: 1) Encode a string 2) Decode a string Q) Quit Enter your selection -=> 2 Enter (brief) text to decrypt: Kheer, ZEURE Enter the number to shift letters by: 3 Decrypted HELLO WORLD MAIN MENU 1) Encode a string 2) Decode a string Q) Quit Enter your selection --> 1 Enter (brief) text to encrypti eleven leaping lavender antelope Enter the number to shift letters by 3 Encrypted: HOHYHQ OHDSLQJ OOYHQGHU DQUHORSH MAIN MENU 1) Encode a string 2) Decode a string 2) Quit Enter your selection ==>