Error cryptography

 /usr/local/lib/python2.7/dist-packages/cryptography/hazmat/primitives/constant_time.py:26: CryptographyDeprecationWarning: Support for your Python version is deprecated. The next version of cryptography will remove support. Please upgrade to a 2.7.x release that supports hmac.compare_digest as soon as possible.

  utils.DeprecatedIn23,

Traceback (most recent call last):

  File "setup.py", line 44, in <module>

    UDPServerSocket.bind((localIP, localPort))

  File "/usr/lib/python2.7/socket.py", line 224, in meth

    return getattr(self._sock,name)(*args)

socket.error: [Errno 99] Cannot assign requested address

Solución:

sudo pip2.7 install cryptography==2.2.2

Se encuentra en :

/usr/local/lib/python2.7/dist-packages/cryptography-2.3.dist-info/INSTALLER