如何使用公钥和私钥在python中编码？

Question

我正在尝试使用公钥和私钥进行编码。但是，当我尝试加密时，我一直收到错误。这就是我到目前为止所做的：

import random

Primes = [2,3,5,7,9,11,13,15]

p = random.choice(Primes)
q = random.choice(Primes)
n = p*q
z = (p-1)*(q-1)

deck = list(range(1,z))

e = random.choice(deck)

d = (z + 1)/e
a= divmod(d*e,z)

PublicKey = (e,n)
PrivateKey = (d,n)

input = raw_input ('Write text: ')
input = input.lower()
message = []
for character in input:
    number = ord(character)
    message.append(number)


#Encrypt
for character in message:
    c = message**e % n 

#Decrypt
for character in c:
    decryption = c**d % n

程序运行正常，直到我通过加密部分。我得到的错误是：

Traceback (most recent call last):
  File "C:/Python27/rsa2.py", line 30, in <module>
    c = message**e % n
TypeError: unsupported operand type(s) for ** or pow(): 'list' and 'int'