title: how generate a constant Unique id from python
body: <p><br>
     my application need use python generate a  constant Unique id for run machine.
  <br>the constant Unique id mean is :<br>
  <strong>anytime in the same machine ,generate  Unique id is always the SAME Unique id.</strong><br>
  <br>
  (maybe like system uuid,but my application not run root,cant't get system-uuid).
  <br>
  btw,i think python uuid model not good for me:<br>
  uuid1():use time,gen a uuid,this is not a  constant Unique id<br>
  uuid3():cant use some string gen a uuid,but this uuid same in any machine.</p>
  
  <p><br><br>
  Thanks!</p>
  
  <p>the same machine: The same cpu+motherboard+OS instalation+same disk.
  action :<br>
  uuid1():use time gen a uuid,this is not a  constant Unique id</p>