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Easily dump python objects to files, and then load them back.

Project description

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:

warehouse[('foo','bar','baz')]
warehouse[['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.

warehouse['foo/bar/baz']
warehouse['foo\\bar\\baz']

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 YYYY-MM-DD format.

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 keys, values, items, and update.

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/.

To do

Add a write-once option

Project details


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Filename, size & hash SHA256 hash help File type Python version Upload date
pickle-warehouse-0.0.11.tar.gz (3.2 kB) Copy SHA256 hash SHA256 Source None Apr 1, 2014

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