Re: Input() in Python3

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Date	Fri, 22 Apr 2011 06:52:20 -0700
From	Westley Martínez <anikom15@gmail.com>
To	python-list@python.org
Subject	Re: Input() in Python3
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On Fri, Apr 22, 2011 at 04:49:19PM +1000, Chris Angelico wrote:
> On Fri, Apr 22, 2011 at 4:22 PM, harrismh777 <harrismh777@charter.net> wrote:
> > now we get this for input():
> >
> >   raw_input("prompt>") --> string
> 
> I would have to say that the 2.x behaviour of input() is a mistake
> that's being corrected in 3.x. With a simple name like input(), it
> should do something simple and straightforward - not eval() the
> expression.
> 
> > to:        a = eval(input("enter a number > "))
> 
> Uhhhh.... NO. NO NO NO. What if someone enters "os.exit()" as their
> number? You shouldn't eval() unchecked user input!
> 
> Chris Angelico

Right, there's no way to check you're getting a number, however using:

a = int(input('enter a number > ')) # use float() for floats

will raise an exception if it can't convert the string.

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Thread

Input() in Python3 harrismh777 <harrismh777@charter.net> - 2011-04-22 01:22 -0500
  Re: Input() in Python3 Chris Angelico <rosuav@gmail.com> - 2011-04-22 16:49 +1000
  Re: Input() in Python3 Chris Angelico <rosuav@gmail.com> - 2011-04-22 16:50 +1000
  Re: Input() in Python3 Chris Rebert <clp2@rebertia.com> - 2011-04-22 00:46 -0700
    Re: Input() in Python3 harrismh777 <harrismh777@charter.net> - 2011-04-23 20:03 -0500
  Re: Input() in Python3 Westley Martínez <anikom15@gmail.com> - 2011-04-22 06:52 -0700
    Re: Input() in Python3 Mel <mwilson@the-wire.com> - 2011-04-22 10:08 -0400
      Re: Input() in Python3 Chris Angelico <rosuav@gmail.com> - 2011-04-23 06:25 +1000
        Re: Input() in Python3 Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-04-22 23:55 +0000
          Re: Input() in Python3 Chris Angelico <rosuav@gmail.com> - 2011-04-23 10:07 +1000
      Re: Input() in Python3 Westley Martínez <anikom15@gmail.com> - 2011-04-23 12:33 -0700
        Re: Input() in Python3 Mel <mwilson@the-wire.com> - 2011-04-25 12:50 -0400

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