Cassandra Batch Insert in Python

General information for the business: Analytics
Description of requirements/functionality: I need to do a batch `INSERT` in `Cassandra` using `Python`.
I am using the latest `Datastax` python driver.

The `INSERTS` are batches of columns that will be in the same row. I will have many rows to insert, but chunks of the data will be in the same row.

I can do individual `INSERTS` in a `for loop` as described in this post:
http://stackoverflow.com/questions/15683989/parameterized-queries-with-the-python-cassandra-module
I am using parametrized query, values as shown in that example.

This did not help:
http://stackoverflow.com/questions/17885238/how-to-multi-insert-rows-in-cassandra

I am not clear how to assemble a parameterized:

BEGIN BATCH
query values1
query values2
...
APPLY BATCH;
cursor.execute(batch_query)

Is this even possible? Will this speed up my `INSERTS`? I have to do millions. Even thousands take too long.
I found some Java info:
http://www.datastax.com/dev/blog/client-side-improvements-in-cassandra-2-0
Specific technologies required: Python, Cassandra
Extra notes: