alphabet=["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", " "] def get_data(): word=input("Enter your message: ") word=word.lower() num=int(input("Enter a number (1-26): ")) while num>26 or num==0: num=int(input("Out of range, Please enter a number (1-26): ")) data=(word,num) return(data) def make_code(word,num): new_word="" for x in word: y=alphabet.index(x) y=y+num if y>26: y=y-27 char=alphabet[y] new_word=new_word +char print(new_word) print() def decode(word,num): new_word="" for x in word: y=alphabet.index(x) y=y-num if y<0: y=y+27 char=alphabet[y] new_word=new_word +char print(new_word) print() def main(): again=True while again==True: print("1) Make a code") print("2) Decode a message") print("3) Quit") print() selection=int(input("Enter your selection: ")) if selection==1: (word,num)=get_data() make_code(word,num) elif selection==2: (word,num)=get_data() decode(word,num) elif selection==3: again=False else: print("Incorrect selection") main()