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Re: Using Python for date calculations

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Date Fri, 21 Nov 2014 21:47:58 +1100
Subject Re: Using Python for date calculations
From Chris Angelico <rosuav@gmail.com>
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On Fri, Nov 21, 2014 at 9:33 PM, alister
<alister.nospam.ware@ntlworld.com> wrote:
> the data entered by the user is processed as if it was python code, this
> means the user could enter a command (or sequence of commands) that cause
> serious problems to you computer including but not limited to:-
>
> Installing a virus
> Deleting all your data
> causing your central heating to explode (unlikely but if your central
> heating is on your network anything is possible)

That's the issue of malice. On a personal system, that's not really a
question; there are plenty of programs I've written for my own use
that have immense power. But there's also the risk of typos - one
small error, and it's gone off doing crazy stuff.

Now, maybe you want it to eval. There are times when I conceptually
want "enter an integer", but it makes good sense to be able to type
"1+2" and have it act as if I typed "3". That's fine... but if you
want eval, write eval into your code. Be explicit:
eval(raw_input("Enter a number: ")) makes it very clear that you're
accepting code at the console.

ChrisA

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Thread

Using Python for date calculations Steve Hayes <hayesstw@telkomsa.net> - 2014-11-21 10:35 +0200
  Re: Using Python for date calculations Chris Angelico <rosuav@gmail.com> - 2014-11-21 19:40 +1100
    Re: Using Python for date calculations Steve Hayes <hayesstw@telkomsa.net> - 2014-11-21 12:15 +0200
      Re: Using Python for date calculations Chris Angelico <rosuav@gmail.com> - 2014-11-21 21:18 +1100
      Re: Using Python for date calculations alister <alister.nospam.ware@ntlworld.com> - 2014-11-21 10:33 +0000
        Re: Using Python for date calculations Chris Angelico <rosuav@gmail.com> - 2014-11-21 21:47 +1100
        Re: Using Python for date calculations random832@fastmail.us - 2014-11-21 08:54 -0500
          Re: Using Python for date calculations alister <alister.nospam.ware@ntlworld.com> - 2014-11-21 14:54 +0000
        Re: Using Python for date calculations random832@fastmail.us - 2014-11-21 08:58 -0500
          Re: Using Python for date calculations Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-11-22 01:55 +1100
            Re: Using Python for date calculations Ned Batchelder <ned@nedbatchelder.com> - 2014-11-21 10:25 -0500
        Re: Using Python for date calculations Chris Angelico <rosuav@gmail.com> - 2014-11-22 01:08 +1100
      Re: Using Python for date calculations Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-11-21 14:50 -0500
        Re: Using Python for date calculations Steve Hayes <hayesstw@telkomsa.net> - 2014-11-22 07:07 +0200
          Re: Using Python for date calculations Chris Angelico <rosuav@gmail.com> - 2014-11-22 16:13 +1100
  Re: Using Python for date calculations Gary Herron <gary.herron@islandtraining.com> - 2014-11-21 00:50 -0800
  Re: Using Python for date calculations Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-11-21 10:20 +0000
    Re: Using Python for date calculations alister <alister.nospam.ware@ntlworld.com> - 2014-11-21 10:38 +0000
    Re: Using Python for date calculations Steve Hayes <hayesstw@telkomsa.net> - 2014-11-21 17:50 +0200
      Re: Using Python for date calculations Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-11-21 16:01 +0000
  Re: Using Python for date calculations Chris Angelico <rosuav@gmail.com> - 2014-11-21 21:27 +1100
  Re: Using Python for date calculations duncan smith <buzzard@invalid.invalid> - 2014-11-21 17:03 +0000
    Re: Using Python for date calculations Steve Hayes <hayesstw@telkomsa.net> - 2014-11-21 21:48 +0200
      Re: Using Python for date calculations Dennis Lee Bieber <bieber.genealogy@earthlink.net> - 2014-11-21 15:32 -0500
  Re: Using Python for date calculations Dennis Lee Bieber <bieber.genealogy@earthlink.net> - 2014-11-21 14:35 -0500
    Re: Using Python for date calculations Paul Blair <p.blair@internode.on.net> - 2014-11-22 06:51 +1100
      Re: Using Python for date calculations Steve Hayes <hayesstw@telkomsa.net> - 2014-11-22 07:31 +0200
    Re: Using Python for date calculations Denis Beauregard <denis.b-at-francogene.com@fr.invalid> - 2014-11-21 15:07 -0500
      Re: Using Python for date calculations Steve Hayes <hayesstw@telkomsa.net> - 2014-11-22 07:34 +0200

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