How to encrypt using 2 keys/keynumbers (Caesar cipher) - python-3.x

Question

How would you encrypt using 2 keys instead of 1 key? It is for school.
So it would ask how much to shift the code by, then ask how many times to shift again, which would shift it even further.
def runProgram():
def choice():
userChoice = input('Do you wish to Encrypt of Decrypt? Enter E or D: ').lower()
if userChoice == "e":
return userChoice
elif userChoice == "d":
return userChoice
else:
print("Invalid Response. Please try again.")
choice()
def getMessage():
userMessage = input("Enter your message: ")
return userMessage
def getKey():
try:
userKey = int(input("Enter a key number (1-26): "))
except:
print("Invalid Option. Please try again.")
getKey()
else:
if userKey < 1 or userKey > 26:
print("Invalid Option. Please try again.")
getKey()
else:
return userKey
def getPees():
try:
userpees = int(input("Enter a key number (1-26): "))
except:
print("Invalid Option. Please try again.")
getpees()
else:
if userpees < 1 or userpees > 26:
print("Invalid Option. Please try again.")
getpees()
else:
return userpees
def getTranslated(userChoice, message, key):
translated = ""
if userChoice == "e":
for character in message:
num = ord(character)
num += key
translated += chr(num)
savedFile = open('Encrypted.txt', 'w')
savedFile.write(translated)
savedFile.close()
return translated
else:
for character in message:
num = ord(character)
num -= key
translated += chr(num)
return translated
def getpranslated(userChoice, message, pees):
pranslated = ""
if userChoice == "e":
for character in message:
num = ord(character)
num += key
pranslated += chr(num)
else:
for character in message:
num = ord(character)
num -= key
pranslated += chr(num)
return pranslated
userChoice = choice() #Runs function for encrypt/decrypt selection. Saves choice made.
message = getMessage() #Run function for user to enter message. Saves message.
key = getKey() #Runs function for user to select key. Saves key choice.
pees= getPees()
sqq= getTranslated(userChoice, message, key)#Runs function to translate message, using the choice, message and key variables)
spp= getTranslated(userChoice, message, pees)
dranslatedMessage = sqq + spp
print( 'hi' + int(spp), int(sqq) )
runProgram()