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A ULID is a universally unique lexicographically sortable identifier. It is

• 128-bit compatible with UUID
• 1.21e+24 unique ULIDs per millisecond
• Lexicographically sortable!
• Canonically encoded as a 26 character string, as opposed to the 36 character UUID
• Uses Crockford's base32 for better efficiency and readability (5 bits per character)
• Case insensitive
• No special characters (URL safe)

In general the structure of a ULID is as follows:

 01AN4Z07BY      79KA1307SR9X4MV3
|----------|    |----------------|
 Timestamp          Randomness
   48bits             80bits

For more information have a look at the original specification.

Use pip to install the library

$ pip install python-ulid

Create a new ULID object from the current timestamp

>>> from ulid import ULID
>>> ULID()
ULID(01E75HZVW36EAZKMF1W7XNMSB4)

or use one of the named constructors

>>> import time, datetime
>>> ULID.from_timestamp(time.time())
ULID(01E75J1MKKWMGG0N5MBHFMRC84)
>>> ULID.from_datetime(datetime.datetime.now())
ULID(01E75J2XBK390V2XRH44EHC10X)

There are several options for encoding the ULID object (e.g. string, hex, int), as well as to access the timestamp attribute in different formats:

>>> str(ulid)
'01BTGNYV6HRNK8K8VKZASZCFPE'
>>> ulid.hex
'015ea15f6cd1c56689a373fab3f63ece'
>>> ulid.timestamp
1505945939.153
>>> ulid.datetime
datetime.datetime(2017, 9, 20, 22, 18, 59, 153000, tzinfo=datetime.timezone.utc)
>>> ulid.to_uuid()
UUID('015ea15f-6cd1-c566-89a3-73fab3f63ece')

• ahawker/ulid
• valohai/ulid2
• mdipierro/ulid