How to make a sha512sum for use in /etc/shadow in python

mksha512sum.py

#!/usr/bin/python

import crypt
import random
import string

def getsalt(mysalt = "", chars = string.letters + string.digits):


    # generate a random 16-character 'salt'
    for i in range(16):
        mysalt = mysalt + random.choice(chars)
    return mysalt

salt="$6$" + getsalt()

cleartextpassword = raw_input('New password: ')

print crypt.crypt(cleartextpassword, salt)