import copy

import types


def shield_sensitive(obj, *args):
    """
    replace all sensitive value  to `******`, according to instance attribute or dict key.
    """
    try:
        obj_ = copy.deepcopy(obj)
        return _shield_sensitive(obj_, *args)
    except:
        return obj


def _shield_sensitive(obj, *args):
    if isinstance(obj, dict):
        origin_type = type(obj)
        obj = dict(obj)
        for key in obj:
            if key in args:
                obj[key] = u'******'
            else:
                obj[key] = _shield_sensitive(obj[key], *args)
        obj = origin_type(obj)
    else:
        for type_ in dir(types):
            # shouldn't use `type(obj) == type_` because type_ is a string,
            # it will equal false.
            if type(obj) == getattr(types, type_):
                return obj
        for attr in dir(obj):
            if attr.startswith('_'):
                continue
            if attr in args:
                setattr(obj, attr, u'******')
            else:
                setattr(obj, attr, _shield_sensitive(getattr(obj, attr), *args))
    return obj


if __name__ == '__main__':
    a = {
        'username': '123',
        'password': 'abc',
    }
    print shield_sensitive(a, 'password')
    # {'username': '123', 'password': u'******'}

    class A(object):
        def __init__(self):
            self.password = ''
            self.username = ''

        def __str__(self):
            return str(self.__dict__)


    print shield_sensitive(A(), 'password')
    # {'username': '', 'password': u'******'}