在Python 3.1中重新启动代码

Restarting code in Python 3.1

我在这里看了几个答案，但没有一个对我有用，我知道这个代码可能有很多问题，但我想知道的是如果在END处输入的话只需重新启动代码是是的'

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Code = input("Do you want to encrypt or decrypt?")
Code = Code.upper()
Answer = ["ENCRYPT","DECRYPT"]

if Code in Answer:

Plaintext = input("What's your message?")
Plaintext = Plaintext.upper()
Shift = int(input("What's the shift number?"))
LengthPT = len(Plaintext)
CodeLetter =""

if Code == ("ENCRYPT"):
for i in range (0,LengthPT):
Pletter = ord(Plaintext[i]) -64
Codeletter = Pletter + Shift
if Codeletter > 26:
Codeletter = Codeletter - 26
Codeascii = chr(Codeletter + 64)
CodeLetter = CodeLetter + Codeascii

elif Code == ("DECRYPT"):
for i in range (0,LengthPT):
Pletter = ord(Plaintext[i]) -64
Codeletter = Pletter - Shift
if Codeletter < 0:
Codeletter = Codeletter + 26
Codeascii = chr(Codeletter + 64)
CodeLetter = CodeLetter + Codeascii
else:
print("Wrong answer.")

if Code == ("ENCRYPT"):
print("Encoded Message =", CodeLetter)

elif Code == ("DECRYPT"):
print("Decoded Message =", CodeLetter)

Answer2 = input("Do you want to restart? (Yes/No):")