import sys, binascii, random

def bytes_xor(a,b):
    # xor two bytestrings of different lengths,
    # truncating the longest one if necessary
    k = []
    if len(a) > len(b):
        for (x, y) in zip(a[:len(b)], b):
            k.append(x ^ y)
    else:
        for (x, y) in zip(a, b[:len(a)]):
            k.append(x ^ y)
    return bytes(k)

def random_key(size=16):
    # make a random bytestring of specified length
    ints = []
    for i in range(size):
        ints.append(random.randint(0x00,0xFF))
    return bytes(ints)

def ascii_2_bytes(msg):
    return bytearray(msg, 'ascii')

def encrypt(key, msg):
    # returns the hexadecimal encoding of the resulting cipher
    cipher = bytes_xor(key, ascii_2_bytes(msg))
    return (str(binascii.hexlify(cipher))[2:-1])

if __name__ == '__main__':

    key = random_key(1024)
    secret_messages = [ ... ] # you're not having them that easily

    for msg in secret_messages:
        print (encrypt(key, msg))