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=======
[](http://travis-ci.org/pycassa/pycassa)
pycassa is a Thrift-based python client library for [Apache Cassandra](http://cassandra.apache.org)
**pycassa does not support CQL** or Cassandra's native protocol, which are a
replacement for the Thrift interface that pycassa is based on. If you are
starting a new project, **it is highly recommended that you use the newer**
[DataStax python driver](https://github.com/datastax/python-driver) instead
of pycassa.
pycassa is open source under the [MIT license](http://www.opensource.org/licenses/mit-license.php).
Documentation
-------------
Documentation can be found here:
[http://pycassa.github.com/pycassa/](http://pycassa.github.com/pycassa/)
It includes [installation instructions](http://pycassa.github.com/pycassa/installation.html),
a [tutorial](http://pycassa.github.com/pycassa/tutorial.html),
[API documentation](http://pycassa.github.com/pycassa/api/index.html),
and a [change log](http://pycassa.github.com/pycassa/changelog.html).
Getting Help
------------
IRC:
* Use the #cassandra channel on irc.freenode.net. If you don't have an IRC client,
you can use [freenode's web based client](http://webchat.freenode.net/?channels=#cassandra).
Mailing List:
* User list: [http://groups.google.com/group/pycassa-discuss](http://groups.google.com/group/pycassa-discuss)
* Developer list: [http://groups.google.com/group/pycassa-devel](http://groups.google.com/group/pycassa-devel)
Installation
------------
If pip is available, you can install the lastest pycassa release
with:
pip install pycassa
If you want to install from a source checkout, make sure you have Thrift
installed, and run setup.py as a superuser:
pip install thrift
python setup.py install
Basic Usage
-----------
To get a connection pool, pass a Keyspace and an optional list of servers:
~~~~~~ {python}
>>> import pycassa
>>> pool = pycassa.ConnectionPool('Keyspace1') # Defaults to connecting to the server at 'localhost:9160'
>>>
>>> # or, we can specify our servers:
>>> pool = pycassa.ConnectionPool('Keyspace1', server_list=['192.168.2.10'])
~~~~~~
To use the standard interface, create a ColumnFamily instance.
~~~~~~ {python}
>>> pool = pycassa.ConnectionPool('Keyspace1')
>>> cf = pycassa.ColumnFamily(pool, 'Standard1')
>>> cf.insert('foo', {'column1': 'val1'})
>>> cf.get('foo')
{'column1': 'val1'}
~~~~~~
insert() will also update existing columns:
~~~~~~ {python}
>>> cf.insert('foo', {'column1': 'val2'})
>>> cf.get('foo')
{'column1': 'val2'}
~~~~~~
You may insert multiple columns at once:
~~~~~~ {python}
>>> cf.insert('bar', {'column1': 'val3', 'column2': 'val4'})
>>> cf.multiget(['foo', 'bar'])
{'foo': {'column1': 'val2'}, 'bar': {'column1': 'val3', 'column2': 'val4'}}
>>> cf.get_count('bar')
2
~~~~~~
get_range() returns an iterable. You can use list() to convert it to a list:
~~~~~~ {python}
>>> list(cf.get_range())
[('bar', {'column1': 'val3', 'column2': 'val4'}), ('foo', {'column1': 'val2'})]
>>> list(cf.get_range(row_count=1))
[('bar', {'column1': 'val3', 'column2': 'val4'})]
~~~~~~
You can remove entire keys or just a certain column:
~~~~~~ {python}
>>> cf.remove('bar', columns=['column1'])
>>> cf.get('bar')
{'column2': 'val4'}
>>> cf.remove('bar')
>>> cf.get('bar')
Traceback (most recent call last):
...
pycassa.NotFoundException: NotFoundException()
~~~~~~
See the [tutorial](http://pycassa.github.com/pycassa/tutorial.html#connecting-to-cassandra) for more details.
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