Simple Vigner Cipher in Python

Vigner Cipher

##Kristofer Hult, Computer Security HW1
from string import punctuation
Begin = 97
Finish = 122
def askKey():
    key = input("What would you like to set for your key?: ")
    return key.lower()
def getPlaintext():
    plaintext = input("Please enter text to be encrypted: ")
    return plaintext
def runEncrypt(key, plaintext):
    ABC = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
    cryptText = ''
    noWhiteSpace = ''

##    for z in range(0, len(plaintext), 1):
##        noPunct=''
##        noPunct += plaintext[z].strip(punctuation)
##    noWhiteSpace = ''
    for z in range(0, len(plaintext), 1):    
       noWhiteSpace += plaintext[z].replace(" ","")
    plantext=noWhiteSpace
    for n in range(0, len(plaintext), 1):
        if plaintext[n].islower():
            bottomNew = ord(plaintext[n]) + ord(key[n%len(key)]) - Begin
            if (bottomNew > Finish) or (bottomNew < Begin):
                bottomNew-=len(ABC)
                cryptText += chr(bottomNew)
            else:
                nextNew = plaintext[n]
                cryptText += nextNew
    return cryptText 
def printCryptText(cryptText):
    print ('Your Encryption is ', cryptText)
  
    
def main():
    key = askKey()
    plaintext=getPlaintext()
    cryptText=runEncrypt(key, plaintext)
    printCryptText(cryptText)
   

main()