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[3.14] gh-89083: add links to RFC 9562 sections in UUID docs (GH-135684) #135747

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Jun 20, 2025
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[3.14] gh-89083: add links to RFC 9562 sections in UUID docs (GH-135684) #135747

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29 changes: 19 additions & 10 deletions Doc/library/uuid.rst
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Expand Up @@ -193,43 +193,52 @@ The :mod:`uuid` module defines the following functions:

.. function:: uuid1(node=None, clock_seq=None)

Generate a UUID from a host ID, sequence number, and the current time. If *node*
is not given, :func:`getnode` is used to obtain the hardware address. If
*clock_seq* is given, it is used as the sequence number; otherwise a random
14-bit sequence number is chosen.
Generate a UUID from a host ID, sequence number, and the current time
according to :rfc:`RFC 9562, §5.1 <9562#section-5.1>`.

When *node* is not specified, :func:`getnode` is used to obtain the hardware
address as a 48-bit positive integer. When a sequence number *clock_seq* is
not specified, a pseudo-random 14-bit positive integer is generated.

If *node* or *clock_seq* exceed their expected bit count,
only their least significant bits are kept.


.. function:: uuid3(namespace, name)

Generate a UUID based on the MD5 hash of a namespace identifier (which is a
UUID) and a name (which is a :class:`bytes` object or a string
that will be encoded using UTF-8).
that will be encoded using UTF-8)
according to :rfc:`RFC 9562, §5.3 <9562#section-5.3>`.


.. function:: uuid4()

Generate a random UUID.
Generate a random UUID in a cryptographically-secure method
according to :rfc:`RFC 9562, §5.4 <9562#section-5.4>`.


.. function:: uuid5(namespace, name)

Generate a UUID based on the SHA-1 hash of a namespace identifier (which is a
UUID) and a name (which is a :class:`bytes` object or a string
that will be encoded using UTF-8).
that will be encoded using UTF-8)
according to :rfc:`RFC 9562, §5.5 <9562#section-5.5>`.


.. function:: uuid6(node=None, clock_seq=None)

Generate a UUID from a sequence number and the current time according to
:rfc:`9562`.
:rfc:`RFC 9562, §5.6 <9562#section-5.6>`.

This is an alternative to :func:`uuid1` to improve database locality.

When *node* is not specified, :func:`getnode` is used to obtain the hardware
address as a 48-bit positive integer. When a sequence number *clock_seq* is
not specified, a pseudo-random 14-bit positive integer is generated.

If *node* or *clock_seq* exceed their expected bit count, only their least
significant bits are kept.
If *node* or *clock_seq* exceed their expected bit count,
only their least significant bits are kept.

.. versionadded:: 3.14

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