How to create a GUID UUID in Python

Question

How do I create a GUID in Python that is platform independent  I hear there is a method using ActivePython on Windows but it s Windows only because it uses COM  Is there a method using plain Python

User · Answer

If you re using Python 2 5 or later  the uuid module is already included with the Python standard distribution   Ex     gt  gt  gt  import uuid  gt  gt  gt  uuid uuid4   UUID  5361a11b-615c-42bf-9bdb-e2c3790ada14

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If you need to pass UUID for a primary key for your model or unique field then below code returns the UUID object -        import uuid  uuid uuid4     If you need to pass UUID as a parameter for URL you can do like below code -  import uuid str uuid uuid4      If you want the hex value for a UUID you can do the below one -   import uuid     uuid uuid4   hex

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2019 Answer  for Windows    If you want a permanent UUID that identifies a machine uniquely on Windows  you can use this trick   Copied from my answer at https   stackoverflow com a 58416992 8874388      from typing import Optional import re import subprocess import uuid  def get windows uuid   - gt  Optional uuid UUID       try            Ask Windows for the device s permanent UUID  Throws if command missing fails          txt   subprocess check output  wmic csproduct get uuid   decode              Attempt to extract the UUID from the command s result          match   re search r  bUUID b  s r n      s r n      txt          if match is not None              txt   match group 1              if txt is not None                    Remove the surrounding whitespace  newlines  space  etc                    and useless dashes etc  by only keeping hex  0-9 A-F  chars                  txt   re sub r   0-9A-Fa-f         txt                     Ensure we have exactly 32 characters  16 bytes                   if len txt     32                      return uuid UUID txt      except          pass   Silence subprocess exception       return None  print get windows uuid      Uses Windows API to get the computer s permanent UUID  then processes the string to ensure it s a valid UUID  and lastly returns a Python object  https   docs python org 3 library uuid html  which gives you convenient ways to use the data  such as 128-bit integer  hex string  etc    Good luck   PS  The subprocess call could probably be replaced with ctypes directly calling Windows kernel DLLs  But for my purposes this function is all I need  It does strong validation and produces correct results

User · Answer

This function is fully configurable and generates unique uid based on the format specified    eg -  8  4  4  4  12    this is the format mentioned and it will generate the following uuid      LxoYNyXe-7hbQ-caJt-DSdU-PDAht56cMEWi    import random as r   def generate uuid            random string              random str seq    0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ          uuid format    8  4  4  4  12          for n in uuid format              for i in range 0 n                   random string    str random str seq r randint 0  len random str seq  - 1                if n    12                  random string     -          return random string

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Copied from   https   docs python org 2 library uuid html  Since the links posted were not active and they keep updating    gt  gt  gt  import uuid   gt  gt  gt    make a UUID based on the host ID and current time  gt  gt  gt  uuid uuid1   UUID  a8098c1a-f86e-11da-bd1a-00112444be1e     gt  gt  gt    make a UUID using an MD5 hash of a namespace UUID and a name  gt  gt  gt  uuid uuid3 uuid NAMESPACE DNS   python org   UUID  6fa459ea-ee8a-3ca4-894e-db77e160355e     gt  gt  gt    make a random UUID  gt  gt  gt  uuid uuid4   UUID  16fd2706-8baf-433b-82eb-8c7fada847da     gt  gt  gt    make a UUID using a SHA-1 hash of a namespace UUID and a name  gt  gt  gt  uuid uuid5 uuid NAMESPACE DNS   python org   UUID  886313e1-3b8a-5372-9b90-0c9aee199e5d     gt  gt  gt    make a UUID from a string of hex digits  braces and hyphens ignored   gt  gt  gt  x   uuid UUID   00010203-0405-0607-0809-0a0b0c0d0e0f      gt  gt  gt    convert a UUID to a string of hex digits in standard form  gt  gt  gt  str x   00010203-0405-0607-0809-0a0b0c0d0e0f    gt  gt  gt    get the raw 16 bytes of the UUID  gt  gt  gt  x bytes   x00 x01 x02 x03 x04 x05 x06 x07 x08 t n x0b x0c r x0e x0f    gt  gt  gt    make a UUID from a 16-byte string  gt  gt  gt  uuid UUID bytes x bytes  UUID  00010203-0405-0607-0809-0a0b0c0d0e0f

User · Answer

I use GUIDs as random keys for database type operations   The hexadecimal form  with the dashes and extra characters seem unnecessarily long to me  But I also like that strings representing hexadecimal numbers are very safe in that they do not contain characters that can cause problems in some situations such as          etc    Instead of hexadecimal  I use a url-safe base64 string  The following does not conform to any UUID GUID spec though  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

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Check this post  helped me a lot  In short  the best option for me was   import random  import string     defining function for random    string id with parameter  def ran gen size  chars string ascii uppercase   string digits        return    join random choice chars  for x in range size       function call for random string    generation with size 8 and string   print  ran gen 8   AEIOSUMA23       Because I needed just 4-6 random characters instead of bulky GUID

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The uuid module provides immutable UUID objects  the UUID class  and the functions uuid1    uuid3    uuid4    uuid5   for generating version 1  3  4  and 5 UUIDs as specified in RFC 4122    If all you want is a unique ID  you should probably call uuid1   or uuid4    Note that uuid1   may compromise privacy since it creates a UUID containing the computer   s network address  uuid4   creates a random UUID   Docs   Python 2 Python 3  Example  for both Python 2 and 3    gt  gt  gt  import uuid  gt  gt  gt  uuid uuid4   UUID  bd65600d-8669-4903-8a14-af88203add38    gt  gt  gt  str uuid uuid4     f50ec0b7-f960-400d-91f0-c42a6d44e3d0   gt  gt  gt  uuid uuid4   hex  9fe2c4e93f654fdbb24c02b15259716c

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