RawMasterKeyProvider runtim-error: AttributeError: can't set attribute

[solzsolz]

hi

I called below method:

cycle_file("sample.txt")

Got below run-time error:

---

traceback (most recent call last):
File ".\testSdk.py", line 116, in
main()
File ".\testSdk.py", line 109, in main
cycle_file("sample.txt")
File ".\testSdk.py", line 61, in cycle_file
master_key_provider.add_master_key(key_id)
File "C:\Users\A610620\AppData\Local\Continuum\Anaconda3\lib\site-packages\aws_encryption_sdk\key_providers\base.py", line 155, in add_master_key
master_key = self._new_master_key(key_id)
File "C:\Users\A610620\AppData\Local\Continuum\Anaconda3\lib\site-packages\aws_encryption_sdk\key_providers\raw.py", line 234, in _new_master_key
wrapping_key=wrapping_key
File "<attrs generated init 97ee74820011dd83c2b5dad60b4be0b7f1be967f>", line 3, in init
AttributeError: can't set attribute

---

exception (2nd exception!) is being thrown here (def _get_raw_key)

def _get_raw_key(self, key_id):
    """Returns a static, randomly-generated symmetric key for the specified key ID.

    :param str key_id: Key ID
    :returns: Wrapping key that contains the specified static key
    :rtype: :class:`aws_encryption_sdk.internal.crypto.WrappingKey`
    """
    try:
        static_key = self._static_keys[key_id]
    except KeyError:
        static_key = os.urandom(32)
        self._static_keys[key_id] = static_key
        try:
            return WrappingKey(wrapping_algorithm=WrappingAlgorithm.AES_256_GCM_IV12_TAG16_NO_PADDING,wrapping_key=static_key,wrapping_key_type=EncryptionKeyType.SYMMETRIC)
        except Exception as e:
            print (e)

[mattsb42-aws]

Hi,

It looks like you ran into this issue, which was breaking our use of attrs and abc.abstractproperty in MasterKeyConfig. I fixed this in #33, and that is now published to PyPI as 1.3.3. Upgrading to this new version will fix this problem.

[mattsb42-aws]

Closing this issue since the fix is published and no additional issue has come up. Feel free to re-open if you keep seeing problems.