Overview

Semidbm is a fast, pure python implementation of a dbm, which is a persistent key value store. It allows you to get and set keys through a dict interface:

import semidbm
db = semidbm.open('testdb', 'c')
db['foo'] = 'bar'
print db['foo']
db.close()

These values are persisted to disk, and you can later retrieve these key/value pairs:

# Then at a later time:
db = semidbm.open('testdb', 'r')
# prints "bar"
print db['foo']

It was written with these things in mind:

• Pure python, supporting python 2.6, 2.7, 3.3, and 3.4.

• Cross platform, works on Windows, Linux, Mac OS X.

• Supports CPython, pypy, and jython (versions 2.7-b3 and higher).

• Simple and Fast (See Benchmarking Semidbm).

Official Docs

Read the semidbm docs for more information and how to use semidbm.

Features

Semidbm originally started off as an improvement over the dumbdbm library in the python standard library. Below are a list of some of the improvements over dumbdbm.

Limitations

• Not thread safe; can’t be accessed by multiple processes.

• The entire index must fit in memory. This essentially means that all of the keys must fit in memory.

Post feedback and issues on github issues, or check out the latest changes at the github repo.