如何在Python中生成可复制(带有种子)的随机UUID [英] How to generate a random UUID which is reproducible (with a seed) in Python
问题描述
Python模块
The uuid4() function of Python's module uuid
generates a random UUID, and seems to generate a different one every time:
In [1]: import uuid
In [2]: uuid.uuid4()
Out[2]: UUID('f6c9ad6c-eea0-4049-a7c5-56253bc3e9c0')
In [3]: uuid.uuid4()
Out[3]: UUID('2fc1b6f9-9052-4564-9be0-777e790af58f')
我希望每次运行脚本时都能生成相同的随机UUID-也就是说,我想将随机生成器植入uuid4()
中.有没有办法做到这一点? (或通过其他方式实现这一目标)?
I would like to be able to generate the same random UUID every time I run a script - that is, I'd like to seed the random generator in uuid4()
. Is there a way to do this? (Or achieve this by some other means)?
我必须使用uuid.UUID()
方法生成一个UUID,并使用一个随机的128位整数(来自random.Random()
的种子实例)作为输入:
I've to generate a UUID using the uuid.UUID()
method with a random 128-bit integer (from a seeded instance of random.Random()
) as input:
import uuid
import random
rd = random.Random()
rd.seed(0)
uuid.UUID(rd.getrandbits(128))
但是,UUID()
似乎不接受此作为输入:
However, UUID()
seems not to accept this as input:
Traceback (most recent call last):
File "uuid_gen_seed.py", line 6, in <module>
uuid.UUID(rd.getrandbits(128))
File "/usr/lib/python2.7/uuid.py", line 133, in __init__
hex = hex.replace('urn:', '').replace('uuid:', '')
AttributeError: 'long' object has no attribute 'replace'
还有其他建议吗?
推荐答案
快到了:
uuid.UUID(int=rd.getrandbits(128))
这是在help
的帮助下确定的:
This was determined with the help of help
:
>>> help(uuid.UUID.__init__)
Help on method __init__ in module uuid:
__init__(self, hex=None, bytes=None, bytes_le=None, fields=None, int=None, version=None) unbound uuid.UUID method
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('{12345678-1234-5678-1234-567812345678}')
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 set according to RFC 4122,
overriding the given 'hex', 'bytes', 'bytes_le', 'fields', or 'int'.
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