A generator library for concise, unambiguous and URL-safe UUIDs.
shortuuid is a simple python library that generates concise, unambiguous, URL-safe
Often, one needs to use non-sequential IDs in places where users will see them, but the
IDs must be as concise and easy to use as possible.
shortuuid solves this problem by
generating uuids using Python's built-in
uuid module and then translating them to
base57 using lowercase and uppercase letters and digits, and removing similar-looking
characters such as l, 1, I, O and 0.
shortuuid you need:
- Python 3.x.
If you have the dependencies, you have multiple options of installation:
- With pip (preferred), do
pip install shortuuid.
- With setuptools, do
- To install the source, download it from
https://github.com/stochastic-technologies/shortuuid and run
python setup.py install.
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_URL) for the resulting
>>> shortuuid.uuid(name="example.com") 'wpsWLdLt9nscn2jbTD3uxe' >>> shortuuid.uuid(name="<http://example.com>") 'c8sh5y9hdSMS6zVnrvf53T'
You can also generate a cryptographically secure random string (using
>>> 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
>>> shortuuid.set_alphabet("aaaaabcdefgh1230123") >>> shortuuid.uuid() '0agee20aa1hehebcagddhedddc0d2chhab3b'
shortuuid will automatically sort and remove duplicates from your alphabet to ensure
>>> 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
>>> 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
If you need to have various alphabets per-thread, you can use the
>>> su = shortuuid.ShortUUID(alphabet="01345678") >>> su.uuid() '034636353306816784480643806546503818874456' >>> su.get_alphabet() '01345678' >>> su.set_alphabet("21345687654123456") >>> su.get_alphabet() '12345678'
shortuuid provides a simple way to generate a short UUID in a terminal:
$ python3 -m shortuuid fZpeF6gcskHbSpTgpQCkcJ
py if you are using Windows).
shortuuid includes a Django field that generates random short UUIDs by default, for
from shortuuid.django_fields import ShortUUIDField class MyModel(models.Model): # A primary key ID of length 16 and a short alphabet. id = ShortUUIDField( length=16, max_length=40, prefix="id_", alphabet="abcdefg1234", primary_key=True, ) # A short UUID of length 22 and the default alphabet. api_key = ShortUUIDField()
The field is the same as the
CharField, with a
length argument (the length of the
alphabet argument, and the
default argument removed. Everything else is
exactly the same, e.g.
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
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))
shortuuid is distributed under the BSD license.
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