python int64,如何从python生成唯一的64位整数？ -ag凯发k8国际

i need to generate unique 64 bits integers from python. i've checked out the uuid module. but the uuid it generates are 128 bits integers. so that wouldn't work.

do you know of any way to generate 64 bits unique integers within python? thanks.

ag凯发k8国际的解决方案

just mask the 128bit int

>>> import uuid

>>> uuid.uuid4().int & (1<<64)-1

9518405196747027403l

>>> uuid.uuid4().int & (1<<64)-1

12558137269921983654l

these are more or less random, so you have a tiny chance of a collision

perhaps the first 64 bits of uuid1 is safer to use

>>> uuid.uuid1().int>>64

9392468011745350111l

>>> uuid.uuid1().int>>64

9407757923520418271l

>>> uuid.uuid1().int>>64

9418928317413528031l

these are largely based on the clock, so much less random but the uniqueness is better

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