You can clone with
HTTPS or Subversion.
see http://cassandra.apache.org/doc/cql3/CQL.html#collections for reference
These are CQL3 features, you can't expose these natively via Thrift.
Yup, @jfelectron is correct. Pycassa can't support these. If you want to work with CQL3, I suggest using this (I'm the author): https://github.com/datastax/python-driver