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In Python, how do you make a GUID/UUID?


In Python, how do I make a platform-independent GUID? I’ve heard there’s a technique that uses ActivePython on Windows, but it’s only for Windows because it relies on COM. Is there a way to do it using ordinary Python?

Asked by Jonathon Watney

Solution #1


Examples (for Python 2 and Python 3):

>>> import uuid

>>> # make a random UUID
>>> uuid.uuid4()

>>> # Convert a UUID to a string of hex digits in standard form
>>> str(uuid.uuid4())

>>> # Convert a UUID to a 32-character hexadecimal string
>>> uuid.uuid4().hex

Answered by stuartd

Solution #2

The uuid module is already included with the Python standard distribution if you’re running Python 2.5 or later.


>>> import uuid
>>> uuid.uuid4()

Answered by Jay

Solution #3 (Because the links posted were inactive and were constantly updated)

>>> import uuid

>>> # make a UUID based on the host ID and current time
>>> uuid.uuid1()

>>> # make a UUID using an MD5 hash of a namespace UUID and a name
>>> uuid.uuid3(uuid.NAMESPACE_DNS, '')

>>> # make a random UUID
>>> uuid.uuid4()

>>> # make a UUID using a SHA-1 hash of a namespace UUID and a name
>>> uuid.uuid5(uuid.NAMESPACE_DNS, '')

>>> # make a UUID from a string of hex digits (braces and hyphens ignored)
>>> x = uuid.UUID('{00010203-0405-0607-0809-0a0b0c0d0e0f}')

>>> # convert a UUID to a string of hex digits in standard form
>>> str(x)

>>> # get the raw 16 bytes of the UUID
>>> x.bytes

>>> # make a UUID from a 16-byte string
>>> uuid.UUID(bytes=x.bytes)

Answered by Balaji Boggaram Ramanarayan

Solution #4

For database operations, I utilize GUIDs as random keys.

I find the hexadecimal form, with its dashes and extra letters, to be excessively long. But I also enjoy that strings representing hexadecimal numbers are particularly safe because they don’t contain characters like ‘+’,’=’, and other characters that can cause problems in specific instances.

I use a url-safe base64 string instead of hexadecimal. The following, however, does not comply with any UUID/GUID specification (other than having the required amount of randomness).

import base64
import uuid

# get a UUID - URL safe, Base64
def get_a_uuid():
    r_uuid = base64.urlsafe_b64encode(uuid.uuid4().bytes)
    return r_uuid.replace('=', '')

Answered by Chris Dutrow

Solution #5

If you need to supply a UUID as a primary key for a model or a unique field, use the code below to get the UUID object –

 import uuid

If you need to pass UUID as a URL parameter, use the code below –

import uuid

You can get the hex value for a UUID by doing the following –

import uuid    

Answered by Mobasshir Bhuiya

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