UUID objects according to RFC 4122
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This 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.
- class
uuid.
UUID
(hex=None, bytes=None, bytes_le=None, fields=None, int=None, version=None) Create a UUID from either a string of 32 hexadecimal digits, a string of 16 bytes as the bytes argument, a string of 16 bytes in little-endian order as the bytes_le argument, a tuple of six integers (32-bit time_low, 16-bit time_mid, 16-bit time_hi_version, 8-bit clock_seq_hi_variant, 8-bit clock_seq_low, 48-bit node) as the fields argument, or a single 128-bit integer as the int argument. When a string of hex digits is given, curly braces, hyphens, and a URN prefix are all optional. For example, these expressions all yield the same UUID:
Exactly one of hex, bytes, bytes_le, fields, or int must be given. The version argument is optional; if given, the resulting UUID will have its variant and version number set according to RFC 4122, overriding bits in the given hex, bytes, bytes_le, fields, or int.
UUID
instances have these read-only attributes:
UUID.
bytes
The UUID as a 16-byte string (containing the six integer fields in big-endian byte order).
UUID.
bytes_le
The UUID as a 16-byte string (with time_low, time_mid, and time_hi_version in little-endian byte order).
UUID.
fields
A tuple of the six integer fields of the UUID, which are also available as six individual attributes and two derived attributes:
Field Meaning time_low
the first 32 bits of the UUIDtime_mid
the next 16 bits of the UUIDtime_hi_version
the next 16 bits of the UUIDclock_seq_hi_variant
the next 8 bits of the UUIDclock_seq_low
the next 8 bits of the UUIDnode
the last 48 bits of the UUIDtime
the 60-bit timestampclock_seq
the 14-bit sequence number
UUID.
hex
The UUID as a 32-character hexadecimal string.
UUID.
int
The UUID as a 128-bit integer.
UUID.
urn
The UUID as a URN as specified in RFC 4122.
UUID.
variant
The UUID variant, which determines the internal layout of the UUID. This will be one of the integer constants
RESERVED_NCS
,RFC_4122
,RESERVED_MICROSOFT
, orRESERVED_FUTURE
.
UUID.
version
The UUID version number (1 through 5, meaningful only when the variant is
RFC_4122
).
The uuid
module defines the following functions:
uuid.
getnode
()Get the hardware address as a 48-bit positive integer. The first time this runs, it may launch a separate program, which could be quite slow. If all attempts to obtain the hardware address fail, we choose a random 48-bit number with its eighth bit set to 1 as recommended in RFC 4122. “Hardware address” means the MAC address of a network interface, and on a machine with multiple network interfaces the MAC address of any one of them may be returned.
uuid.
uuid1
(node=None, clock_seq=None)Generate a UUID from a host ID, sequence number, and the current time. If node is not given,
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.
uuid.
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 string).
uuid.
uuid4
()Generate a random UUID.
uuid.
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 string).
The uuid
module defines the following namespace identifiers for use with uuid3()
or uuid5()
.
uuid.
NAMESPACE_DNS
When this namespace is specified, the name string is a fully-qualified domain name.
uuid.
NAMESPACE_URL
When this namespace is specified, the name string is a URL.
uuid.
NAMESPACE_OID
When this namespace is specified, the name string is an ISO OID.
uuid.
NAMESPACE_X500
When this namespace is specified, the name string is an X.500 DN in DER or a text output format.
The uuid
module defines the following constants for the possible values of the variant
attribute:
uuid.
RESERVED_NCS
Reserved for NCS compatibility.
uuid.
RFC_4122
Specifies the UUID layout given in RFC 4122.
uuid.
RESERVED_MICROSOFT
Reserved for Microsoft compatibility.
uuid.
RESERVED_FUTURE
Reserved for future definition.
See also
- RFC 4122 - A Universally Unique IDentifier (UUID) URN Namespace
- This specification defines a Uniform Resource Name namespace for UUIDs, the internal format of UUIDs, and methods of generating UUIDs.
21.20.1. Example
Here are some examples of typical usage of the uuid
module:
- UUID objects according to RFC 4122
- UUID (RFC 4122)
- According to Bartjens UVA
- According to Bartjens UVA
- Blog according to Scott Guthrie
- The Future According to ASP+
- UVA - 817 According to Bartjens
- uva 817According to Bartjens
- Using org.hibernate.id.UUIDHexGenerator which does not generate IETF RFC 4122 compliant UUID values;
- Using org.hibernate.id.UUIDHexGenerator which does not generate IETF RFC 4122 compliant UUID values;
- Using org.hibernate.id.UUIDHexGenerator which does not generate IETF RFC 4122 compliant UUID values;
- Using org.hibernate.id.UUIDHexGenerator which does not generate IETF RFC 4122 compliant UUID values;
- Using org.hibernate.id.UUIDHexGenerator which does not generate IETF RFC 4122 compliant UUID values;
- How to send sysLog according to RFC3164
- G3: random number according to their weigtht
- UVA 817 - According to Bartjens(暴力搜索)
- uva 817 - According to Bartjens(暴力)
- UVa 817 - According to Bartjens(暴力)
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