As is, this seems to crash cqlsh due to a TypeError in the cython protocol handler:

Traceback (most recent call last):
  File "/usr/bin/cqlsh", line 153, in <module>
    from cassandra.cluster import Cluster
  File "cluster.py", line 46, in init cassandra.cluster (cassandra/cluster.c:75524)
  File "connection.py", line 42, in init cassandra.connection (cassandra/connection.c:23564)
  File "protocol.py", line 1136, in init cassandra.protocol (cassandra/protocol.c:35123)
  File "protocol.py", line 1118, in cassandra.protocol.cython_protocol_handler (cassandra/protocol.c:21219)
TypeError: Class-level classmethod() can only be called on a method_descriptor or instance method.

Removing protocol.so or otherwise disabling cython support seems to make things work correctly.

This update has been unpushed.