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( [hex[, bytes[, bytes_le[, fields[, int[, version]]]]]])
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:
UUID('')
UUID('12345678123456781234567812345678')
UUID('urn:uuid:12345678-1234-5678-1234-567812345678')
UUID(bytes='\x12\x34\x56\x78'*4)
UUID(bytes_le='\x78\x56\x34\x12\x34\x12\x78\x56' +
'\x12\x34\x56\x78\x12\x34\x56\x78')
UUID(fields=(0x12345678, 0x1234, 0x5678, 0x12, 0x34, 0x567812345678))
UUID(int=0x12345678123456781234567812345678)
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:
bytes
The UUID as a 16-byte string (containing the six integer fields in big-endian byte order).
bytes_le
The UUID as a 16-byte string (with time_low, time_mid, and time_hi_version in little-endian byte order).
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 UUID |
| time_mid | the next 16 bits of the UUID |
| time_hi_version | the next 16 bits of the UUID |
| clock_seq_hi_variant | the next 8 bits of the UUID |
| clock_seq_low | the next 8 bits of the UUID |
| node | the last 48 bits of the UUID |
| time | the 60-bit timestamp |
| clock_seq | the 14-bit sequence number |
hex
The UUID as a 32-character hexadecimal string.
int
The UUID as a 128-bit integer.
urn
The UUID as a URN as specified in RFC 4122.
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, or RESERVED_FUTURE.
version
The UUID version number (1 through 5, meaningful only when the variant is RFC_4122).
The uuid module defines the following functions:
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.
uuid1( [node[, clock_seq]])
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.
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).
uuid4( )
Generate a random 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().
NAMESPACE_DNS
When this namespace is specified, the name string is a fully-qualified domain name.
NAMESPACE_URL
When this namespace is specified, the name string is a URL.
NAMESPACE_OID
When this namespace is specified, the name string is an ISO OID.
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:
RESERVED_NCS
Reserved for NCS compatibility.
RFC_4122
Specifies the UUID layout given in RFC 4122.
RESERVED_MICROSOFT
Reserved for Microsoft compatibility.
RESERVED_FUTURE
Reserved for future definition.
Source of the article
Python Documentation
