Unbound Local Error Python Cipher - python-3.x

Question

I have been trying out this Ceasar Cipher and I am getting an error that I can't seem to get around. I am currently using python36 and wondering if there is anyone that can let me know why the unbound local error is coming up. Thank you!
#Ceasar Cipher
SYMBOLS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
MAX_KEY_SIZE = len(SYMBOLS)
def getMode():
while True:
print('Do you wish to ENCRYPT or DECRYPT a message?')
mode = input().lower()
if mode in ['encrypt', 'e', 'decrypt', 'd']:
return mode
else:
print('Enter either "encrypt" or "e" or "decrypt" or "d".')
def getMessage():
print('Enter your message:')
return input()
def getKey():
key = 0
while True:
print('Enter the key number (1-%s)' % (MAX_KEY_SIZE))
key = int(input())
if (key >= 1 and key <= MAX_KEY_SIZE):
return key
def getTranslatedMessage(mode, message, key):
if mode[0] == 'd':
key = -key
translated = ''
for symbol in message:
symbolIndex == SYMBOLS.find(symbol)
if symbolIndex == -1: # Symbol not found in SYMBOLS.
# Just add the symbol without any change.
translated += symbol
else:
# Encrypt or decrypt.
symbolIndex += key
if symbolIndex >= len(SYMBOLS):
symbolIndex -= len(SYMBOLS)
elif symbolIndex < 0:
symbolIndex += len(SYMBOLS)
translated += SYMBOLS[symbolIndex]
return translated
mode = getMode()
message = getMessage()
key = getKey()
print('Your translated text is:')
print(getTranslatedMessage(mode, message, key))
Update
The error I receive looks like this:
Traceback (most recent call last):
File "C:\Users\Badger\Desktop\DEV\Scripts\Ceasar_Cipher.py", line 52, in
print(getTranslatedMessage(mode, message, key))
File "C:\Users\Badger\Desktop\DEV\Scripts\Ceasar_Cipher.py", line 32, in getTranslatedMessage
symbolIndex == SYMBOLS.find(symbol)
UnboundLocalError: local variable 'symbolIndex' referenced before assignment

Answer 1

The key for the Caesar Cipher will be a number from 1 to 26.
your len(SYMBOLS) is larger than 26.
This Code Worked for me with python3
MAX_KEY_SIZE = 26
def getMode():
while True:
print('Do you wish to encrypt or decrypt a message?')
mode = raw_input().lower()
if mode in 'encrypt e decrypt d'.split():
return mode
else:
print('Enter either "encrypt" or "e" or "decrypt" or "d".')
def getMessage():
print('Enter your message:')
return raw_input()
def getKey():
key = 0
while True:
print('Enter the key number (1-%s)' % (MAX_KEY_SIZE))
key = int(input())
if (key >= 1 and key <= MAX_KEY_SIZE):
return key
def getTranslatedMessage(mode, message, key):
if mode[0] == 'd':
key = -key
translated = ''
for symbol in message:
if symbol.isalpha():
num = ord(symbol)
num += key
if symbol.isupper():
if num > ord('Z'):
num -= 26
elif num < ord('A'):
num += 26
elif symbol.islower():
if num > ord('z'):
num -= 26
elif num < ord('a'):
num += 26
translated += chr(num)
else:
translated += symbol
return translated
mode = getMode()
message = getMessage()
key = getKey()
print('Your translated text is:')
print(getTranslatedMessage(mode, message, key))

Answer 2

I found what was wrong...
I set the symbolIndex to "==" when I was assigning it.
After changing it to "=" everything worked beautifully!