I seem to be having some problems with Vigenere.py for problem set 6. I am attempting to use ord to change the ith character in the plaintext into ASCii, but it is not working. Everything else seems to be logical I think?

Thank you for your help.

import sys

if len(sys.argv) == 2:
    key = str(sys.argv[1])

    if str.isalpha(key) == True:
        plaintext = str(input("Enter the plaintext you wish you encrypt: "))
        print ("ciphertext = ", end='')

        for i in plaintext:
            plaintext = ord(str(plaintext[i]))

            #preventing long plaintext words from not being incripted
            if i > len(ciphertext) or k > len(ciphertext):
                k = 0
                cipher = ord(str(ciphertext[k]))
                k += 1
            else:
                ciphertext = ord(str(ciphertext[i]))
            #

            final = (plaintext + ciphertext)%26

            print (chr(final), end='')
    else:
        print ("Enter only letters")

else:
    print ("Usage: Enter a key to use to ciphers")

I seem to be having some problems with Vigenere.py for problem set 6. I am attempting to use ord to change the ith character in the plaintext into ASCii, but it is not working. Everything else seems to be logical I think?

Thank you for your help.

import sys

if len(sys.argv) == 2:
    key = str(sys.argv[1])

    if str.isalpha(key) == True:
        plaintext = str(input("Enter the plaintext you wish you encrypt: "))
        print ("ciphertext = ", end='')

        for i in plaintext:
            plaintext = ord(str(plaintext[i]))

            #preventing long plaintext words from not being encrypted
            if i > len(ciphertext) or k > len(ciphertext):
                k = 0
                cipher = ord(str(ciphertext[k]))
                k += 1
            else:
                ciphertext = ord(str(ciphertext[i]))
            #

            final = (plaintext + ciphertext)%26

            print (chr(final), end='')
    else:
        print ("Enter only letters")

else:
    print ("Usage: Enter a key to use to ciphers")