Ceasar Cipher help

[barks33]

Hi all, im writing a caesar cipher and ive done most of the program (see below)

def decrypt(ciphertext, shift):
    decrytped_text = " "


    for letter in ciphertext:
        if letter.isalpha():
            num = ord(letter)
            num += key

            if letter.isupper():
                if num > ord('Z'):
                    num -= 26
                elif num < ord ('A'):
                    num += 26
            elif letter.islower():
                if num > ord('z'):
                   num -= 26
                elif num < ord('a'):
                    num +=26

            decrypted_text += chr(num)
        else:
            decrypted_text += letter
    return decrypted_text

print 'Decryted text is : '
print decrypt(ciphertext, shift)

[/I][/I]
now when i run this program it says shift and ciphertext are not defined. I understand that they aren't defined im just having difficulty in knowing where and how to define these to parameters so that my program works.

If you coul help or point me in the right direction that would be great.

Thanks


oh and heres what im testing it on :

decrypt('bcdefg hijklmnopqrstuv wxyza', 1)
'abcdefghijklmn opqrstuvwxyz'

very simple i know, but im a n00b at python :)
any help would be greatly appreciated.

[barks33]

and it all formatted wrong... i had all the correct spacing by the way just failed in the box.

[bvdet]

The error message is telling you that the variables are not defined. That gives it away. You need to assign a value to the variables.

ciphertext = 'bcdefghijklmnopqrstuvwxyza'
shift = -1

You also had a typo with the name decrypted_text and an undefined variable named key.