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Re: Template language for random string generation

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From Devin Jeanpierre <jeanpierreda@gmail.com>
Date Sun, 10 Aug 2014 05:43:04 -0700
Subject Re: Template language for random string generation
To Paul Wolf <paulwolf333@gmail.com>
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On Fri, Aug 8, 2014 at 2:01 AM, Paul Wolf <paulwolf333@gmail.com> wrote:
> This is a proposal with a working implementation for a random string generation template syntax for Python. `strgen` is a module for generating random strings in Python using a regex-like template language. Example:
>
>     >>> from strgen import StringGenerator as SG
>     >>> SG("[\l\d]{8:15}&[\d]&[\p]").render()
>     u'F0vghTjKalf4^mGLk'

Why aren't you using regular expressions? I am all for conciseness,
but using an existing format is so helpful...

Unfortunately, the equivalent regexp probably looks like
r'(?=.*[0-9])(?=.*[A-Z])(?=.*[a-z])[a-zA-Z0-9]{8:15}'

(I've been working on this kind of thing with regexps, but it's still
incomplete.)

> * Uses SystemRandom class (if available, or falls back to Random)

This sounds cryptographically weak. Isn't the normal thing to do to
use a cryptographic hash function to generate a pseudorandom sequence?

Someone should write a cryptographically secure pseudorandom number
generator library for Python. :(

(I think OpenSSL comes with one, but then you can't choose the seed.)

-- Devin

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Thread

Template language for random string generation Paul Wolf <paulwolf333@gmail.com> - 2014-08-08 02:01 -0700
  Re: Template language for random string generation Chris Angelico <rosuav@gmail.com> - 2014-08-08 19:22 +1000
    Re: Template language for random string generation Paul Wolf <paulwolf333@gmail.com> - 2014-08-08 02:42 -0700
      Re: Template language for random string generation Ned Batchelder <ned@nedbatchelder.com> - 2014-08-08 07:20 -0400
        Re: Template language for random string generation Paul Wolf <paulwolf333@gmail.com> - 2014-08-08 06:02 -0700
      Re: Template language for random string generation Chris Angelico <rosuav@gmail.com> - 2014-08-08 21:29 +1000
        Re: Template language for random string generation Paul Wolf <paulwolf333@gmail.com> - 2014-08-08 06:03 -0700
  Re: Template language for random string generation Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-09 00:08 +1000
  Re: Template language for random string generation Skip Montanaro <skip@pobox.com> - 2014-08-08 09:35 -0500
    Re: Template language for random string generation cwolf.algo@gmail.com - 2014-08-08 11:43 -0700
      Re: Template language for random string generation Nick Cash <nick.cash@npcinternational.com> - 2014-08-08 20:28 +0000
  Re: Template language for random string generation Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-08 16:03 -0600
    Re: Template language for random string generation Paul Wolf <paulwolf333@gmail.com> - 2014-08-08 23:52 -0700
      Re: Template language for random string generation Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-09 01:49 -0600
      Re: Template language for random string generation Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-09 01:57 -0600
  Re: Template language for random string generation Devin Jeanpierre <jeanpierreda@gmail.com> - 2014-08-10 05:43 -0700
    Re: Template language for random string generation Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-11 02:31 +1000
      Re: Template language for random string generation Devin Jeanpierre <jeanpierreda@gmail.com> - 2014-08-10 11:28 -0700
        Re: Template language for random string generation Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-11 12:22 +1000
          Re: Template language for random string generation Chris Angelico <rosuav@gmail.com> - 2014-08-11 12:31 +1000
          Re: Template language for random string generation Devin Jeanpierre <jeanpierreda@gmail.com> - 2014-08-11 00:01 -0700
      Re: Template language for random string generation Chris Angelico <rosuav@gmail.com> - 2014-08-11 05:25 +1000
      Re: Template language for random string generation Paul Wolf <paulwolf333@gmail.com> - 2014-08-10 22:06 -0700
        Re: Template language for random string generation Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-11 08:58 +0100
    Re: Template language for random string generation Paul Wolf <paulwolf333@gmail.com> - 2014-08-10 09:34 -0700
      Re: Template language for random string generation Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-10 10:47 -0600
        Re: Template language for random string generation Paul Wolf <paulwolf333@gmail.com> - 2014-08-10 21:56 -0700
      Re: Template language for random string generation Devin Jeanpierre <jeanpierreda@gmail.com> - 2014-08-10 11:48 -0700
  Re: Template language for random string generation Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-10 10:38 -0600

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