{}
user_text = input(" please enter your text : ")
user_text = user_text.replace(" ","") # to remove spaces
quest=int(input(" choose 1 if encryption and 2 if decryption : "))
coded_text =[]
if quest == 1:
ascii_of_user = [ord(c.lower()) for c in user_text] # where lower() to make lowe and upper treated the same , c is the ascii of characters of text i working on
for c in ascii_of_user :
if 'a' <= chr(c) <= 'z': #alphabets starts from a to z
coded_text.append(chr((c - ord('a') + 2) % 26 + ord('a'))) # -ord('a') = 97 to identify the order of character in order of alphabet , +2 to shift , % 26 to return the character if it y or z (26 related to we have 26 letters) then + ord('a') to get the position back to the needed value
else :
coded_text.append(chr(c))
final_coded = "" .join(coded_text) # join is to make text in only one string not character by character in list
else :
ascii_of_user = [ord(c.lower()) for c in user_text] # where lower() to make lowe and upper treated the same , c is the ascii of characters of text i working on
for c in ascii_of_user :
if 'a' <= chr(c) <= 'z': #alphabets starts from a to z
coded_text.append(chr((c - ord('a') - 2) % 26 + ord('a'))) # -ord('a') = 97 to identify the order of character in order of alphabet , +2 to shift , % 26 to return the character if it y or z (26 related to we have 26 letters) then + ord('a') to get the position back to the needed value
else :
coded_text.append(chr(c))
final_coded = "" .join(coded_text) # join is to make text in only one string not character by character in list
print(final_coded)