hash_stuff.py

import hashlib
import json


class HashWrapper(object):
    """
    Wraps a hashlib object to make it file-like (i.e. give it a `write` method)
    """

    def __init__(self, hashobj=None):
        self.hashobj = hashlib.sha1() if not hashobj else hashobj
        self.write = hashobj.update

    def add(self, item):
        json.dump(item, self, sort_keys=True)