hash_obj.py

import hashlib
import json
import sys

def hash_obj(obj):
    try:
        return hashlib.md5(json.dumps(obj)).hexdigest()
    except TypeError:
        pass

    if type(obj) is dict:
        outobj = {}
        for k, v in obj.iteritems():
            try:
                outobj[k] = json.dumps(v)
            except TypeError:
                pass
    elif type(obj) in (list, tuple, set):
        outobj = []
        for v in obj:
            try:
                outobj.append(json.dumps(v))
            except TypeError:
                pass
    else:
        print('[error] obj can not be hashed', file=sys.stderr)
        sys.exit(1)

    return hashlib.md5(json.dumps(outobj)).hexdigest()