Easily dump python objects to files, and then load them back.
Pickle Warehouse makes it easy to save Python objects to files with meaningful identifiers.
How to use
Pickle Warehouse provides a dictionary-like object that is associated with a particular directory on your computer.
from pickle_warehouse import Warehouse warehouse = Warehouse('/tmp/a-directory')
The keys correspond to files, and the values get pickled to the files.
warehouse['filename'] = range(100) import pickle range(100) == pickle.load(open('/tmp/a-directory/filename', 'rb'))
You can also read and delete things.
# Read range(100) == warehouse['filename'] # Delete del(warehouse['filename'])
The coolest part is that the key gets interpreted in a fancy way. Aside from strings and string-like objects, you can use iterables of strings; all of these indices refer to the file /tmp/a-directory/foo/bar/baz:
If you pass a relative path to a file, it will be broken up as you’d expect; that is, strings get split on slashes and backslashes.
Note well: Specifying an absolute path won’t save things outside the warehouse directory.
warehouse['/foo/bar/baz'] # -> foo, bar, baz warehouse['C:\\foo\\bar\\baz'] # -> c, foo, bar, baz # (lowercase "c")
If you pass a URL, it will also get broken up in a reasonable way.
# /tmp/a-directory/http/thomaslevine.com/!/?foo=bar#baz warehouse['http://thomaslevine.com/!/?foo=bar#baz'] # /tmp/a-directory/thomaslevine.com/!?foo=bar#baz warehouse['thomaslevine.com/!?foo=bar#baz']
Dates and datetimes get converted to
import datetime # /tmp/a-directory/2014-02-26 warehouse[datetime.date(2014,2,26)] warehouse[datetime.datetime(2014,2,26,13,6,42)]
And you can mix these formats!
# /tmp/a-directory/http/thomaslevine.com/open-data/2014-02-26 warehouse[('http://thomaslevine.com/open-data', datetime.date(2014,2,26))]
It also has typical dictionary methods like
When to use
pickle-warehouse is for when you want a persistant store of Python objects. If you want an in-memory pickle store, look at _pickleDB: https://pythonhosted.org/pickleDB/.
Add a write-once option