shortuuid 1.0.2

Installation

To install shortuuid you need:

• Python 2.5 or later in the 2.x line (earlier than 2.6 not tested), or any 3.x.

If you have the dependencies, you have multiple options of installation:

• With pip (preferred), do pip install shortuuid.

• With setuptools, do easy_install shortuuid.

• To install the source, download it from https://github.com/stochastic-technologies/shortuuid and do python setup.py install.

Usage

To use shortuuid, just import it in your project like so:

>>> import shortuuid

You can then generate a short UUID:

>>> shortuuid.uuid()
'vytxeTZskVKR7C7WgdSP3d'

If you prefer a version 5 UUID, you can pass a name (DNS or URL) to the call and it will be used as a namespace (uuid.NAMESPACE_DNS or uuid.NAMESPACE_URL) for the resulting UUID:

>>> shortuuid.uuid(name="example.com")
'wpsWLdLt9nscn2jbTD3uxe'
>>> shortuuid.uuid(name="http://example.com")
'c8sh5y9hdSMS6zVnrvf53T'

You can also generate a cryptographically secure random string (using os.urandom(), internally) with:

>>> shortuuid.ShortUUID().random(length=22)
'RaF56o2r58hTKT7AYS9doj'

To see the alphabet that is being used to generate new UUIDs:

>>> shortuuid.get_alphabet()
'23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'

If you want to use your own alphabet to generate UUIDs, use set_alphabet():

>>> shortuuid.set_alphabet("aaaaabcdefgh1230123")
>>> shortuuid.uuid()
'0agee20aa1hehebcagddhedddc0d2chhab3b'

shortuuid will automatically sort and remove duplicates from your alphabet to ensure consistency:

>>> shortuuid.get_alphabet()
'0123abcdefgh'

If the default 22 digits are too long for you, you can get shorter IDs by just truncating the string to the desired length. The IDs won’t be universally unique any longer, but the probability of a collision will still be very low.

To serialize existing UUIDs, use encode() and decode():

>>> import uuid ; u = uuid.uuid4() ; u
UUID('6ca4f0f8-2508-4bac-b8f1-5d1e3da2247a')
>>> s = shortuuid.encode(u) ; s
'cu8Eo9RyrUsV4MXEiDZpLM'
>>> shortuuid.decode(s) == u
True
>>> short = s[:7] ; short
'cu8Eo9R'
>>> h = shortuuid.decode(short)
UUID('00000000-0000-0000-0000-00b8c0b9f952')
>>> shortuuid.decode(shortuuid.encode(h)) == h
True

Class-based usage

If you need to have various alphabets per-thread, you can use the ShortUUID class, like so:

>>> su = shortuuid.ShortUUID(alphabet="01345678")
>>> su.uuid()
'034636353306816784480643806546503818874456'
>>> su.get_alphabet()
'01345678'
>>> su.set_alphabet("21345687654123456")
>>> su.get_alphabet()
'12345678'

Command-line usage

shortuuid provides a simple way to generate a short UUID in a terminal:

$ python3 -m shortuuid
fZpeF6gcskHbSpTgpQCkcJ

(Replace python3 with py if you are using Windows)

Compatibility note

Versions of ShortUUID prior to 1.0.0 generated UUIDs with their MSB last, i.e. reversed. This was later fixed, but if you have some UUIDs stored as a string with the old method, you need to pass legacy=True to decode() when converting your strings back to UUIDs.

That option will go away in the future, so you will want to convert your UUIDs to strings using the new method. This can be done like so:

>>> new_uuid_str = encode(decode(old_uuid_str, legacy=True))

License

shortuuid is distributed under the BSD license.