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Re: Random string of digits?

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Roy Smith於 2011年12月26日星期一UTC+8上午1時41分29秒寫道：
> On Mon, 26 Dec 2011 03:11:56 +1100, Chris Angelico wrote:
> > > I prefer not to rely on the source. That tells me what happens, not
> > > what's guaranteed to happen. 
> 
> Steven D'Aprano <steve+comp....@pearwood.info> wrote:
> > In this case, the source explicitly tells you that the API includes 
> > support for arbitrary large ranges if you include a getrandbits() method:
> > 
> >      Optionally, implement a getrandbits() method so that randrange()
> >      can cover arbitrarily large ranges.
> > 
> > I call that a pretty strong guarantee.
> 
> I think you mis-understood Chris's point.  The documentation is the 
> specification of how something behaves.  If the documentation doesn't 
> say it, you can't rely on it.  The user should never have to read the 
> source to know how to use a function, or what they can depend on.  Now, 
> I'm not saying that reading the source isn't useful for a deeper 
> understanding, but it should be understood that any insights you glean 
> from doing that are strictly implementation details.
> 
> If you're saying that there are guarantees made by the implementation of 
> getrandbits() which are not documented, then one of two things are true:
> 
> 1) It is intended that users can depend on that behavior, in which case 
> it's a bug in the docs, and the docs should be updated.
> 
> or
> 
> 2) It is not intended that users can depend on that behavior, in which 
> case they would be foolish to do so.

Random bit generations for RSA2048 encoding  and cryptography applications 
in python is simple and elegant.

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Random string of digits? Roy Smith <roy@panix.com> - 2011-12-25 08:30 -0500
  Re: Random string of digits? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-25 13:48 +0000
    Re: Random string of digits? Chris Angelico <rosuav@gmail.com> - 2011-12-26 00:54 +1100
      Re: Random string of digits? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-25 15:46 +0000
        Re: Random string of digits? Chris Angelico <rosuav@gmail.com> - 2011-12-26 03:11 +1100
          Re: Random string of digits? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-25 17:18 +0000
            Re: Random string of digits? Roy Smith <roy@panix.com> - 2011-12-25 12:41 -0500
              Re: Random string of digits? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-25 11:50 -0800
              Re: Random string of digits? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-26 03:00 +0000
                Re: Random string of digits? Chris Angelico <rosuav@gmail.com> - 2011-12-26 14:43 +1100
                Re: Random string of digits? Roy Smith <roy@panix.com> - 2011-12-25 23:17 -0500
                Re: Random string of digits? Chris Angelico <rosuav@gmail.com> - 2011-12-26 15:26 +1100
    Re: Random string of digits? Serhiy Storchaka <storchaka@gmail.com> - 2011-12-25 19:32 +0200
  Re: Random string of digits? Chris Angelico <rosuav@gmail.com> - 2011-12-26 00:50 +1100
    Re: Random string of digits? Roy Smith <roy@panix.com> - 2011-12-25 09:21 -0500
      Re: Random string of digits? Chris Angelico <rosuav@gmail.com> - 2011-12-26 01:51 +1100
        Re: Random string of digits? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-25 15:27 +0000
  Re: Random string of digits? Chris Angelico <rosuav@gmail.com> - 2011-12-26 00:51 +1100
  Re: Random string of digits? Peter Otten <__peter__@web.de> - 2011-12-25 16:21 +0100

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