Fixed a problem with the openssl-python stubs. It was using `unicode`, which is not defined in Python 3. I conditionalized its use based on Python version check.
Co-authored-by: Eric Traut <erictr@microsoft.com>
0 is the default value for the timeout argument for both blpop and brpop. When the timeout is `0`, the return type is non-nullable. Otherwise the return type is optional.
I tested my change with the following code
```python
from typing import Optional, Tuple
import redis
def test_blpop_timeout(r: redis.Redis) -> None:
a: Tuple[bytes, bytes] = r.blpop('')
b: Tuple[bytes, bytes] = r.blpop('',timeout=0)
c: Optional[Tuple[bytes, bytes]] = r.blpop('', timeout=1)
d: Optional[Tuple[bytes, bytes]] = r.blpop('', timeout=1.0)
def test_brpop_timeout(r: redis.Redis) -> None:
a: Tuple[bytes, bytes] = r.brpop('')
b: Tuple[bytes, bytes] = r.brpop('',timeout=0)
c: Optional[Tuple[bytes, bytes]] = r.brpop('', timeout=1)
d: Optional[Tuple[bytes, bytes]] = r.brpop('', timeout=1.0)
```
According to the docs in paramiko the return type will always be bytes
```
.. note::
``'b'`` mode flag is ignored (``self.FLAG_BINARY`` in
``self._flags``), because SSH treats all files as binary, since we
have no idea what encoding the file is in, or even if the file is
text data.
:param int size: maximum number of bytes to read
:returns:
data read from the file (as bytes), or an empty string if EOF was
encountered immediately
```
