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Re: Newbie question about evaluating raw_input() responses

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On Wed, May 22, 2013 at 4:52 PM, Kevin Xi <kevin.xgr@gmail.com> wrote:
> On Wednesday, May 22, 2013 2:23:15 PM UTC+8, C. N. Desrosiers wrote:
>> age=raw_input('Enter your age: ')
>> if age > 18:
>
> You can either use `raw_input` to read data and convert it to right type, or use `input` to get an integer directly. Read this: http://docs.python.org/2/library/functions.html#raw_input
> http://docs.python.org/2/library/functions.html#input

No! No, please do NOT use input()! It does not return an integer; it
*evaluates* (that is, executes) the input.

>>> input('Enter your age: ')
Enter your age: 18
18
>>> input('Enter your age: ')
Enter your age: 1+2+4+5+6
18
>>> input('Enter your age: ')
Enter your age: sys.stdout.write("Hello, world!\n") or 18
Hello, world!
18
>>> input('Enter your age: ')
Enter your age: sys.exit(0)

This is almost certainly NOT what you want to have in your script. If
you want an integer, just pass it through int() as Fabio suggested.

Please do not use, or advocate using, this steam-powered Izzet goblin
hammer for cracking walnuts.

ChrisA

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Thread

Newbie question about evaluating raw_input() responses "C. N. Desrosiers" <cndesrosiers@gmail.com> - 2013-05-21 23:23 -0700
  Re: Newbie question about evaluating raw_input() responses Fábio Santos <fabiosantosart@gmail.com> - 2013-05-22 07:35 +0100
    Re: Newbie question about evaluating raw_input() responses "C. N. Desrosiers" <cndesrosiers@gmail.com> - 2013-05-21 23:52 -0700
  Re: Newbie question about evaluating raw_input() responses Kevin Xi <kevin.xgr@gmail.com> - 2013-05-21 23:52 -0700
    Re: Newbie question about evaluating raw_input() responses Chris Angelico <rosuav@gmail.com> - 2013-05-22 17:19 +1000
    Re: Newbie question about evaluating raw_input() responses Alister <alister.ware@ntlworld.com> - 2013-05-22 22:31 +0000
      RE: Newbie question about evaluating raw_input() responses Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-23 01:55 +0300
      Re: Newbie question about evaluating raw_input() responses Kevin Xi <kevin.xgr@gmail.com> - 2013-05-22 18:56 -0700
      Re: Newbie question about evaluating raw_input() responses Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-05-23 04:47 +0000
        Re: Newbie question about evaluating raw_input() responses Chris Angelico <rosuav@gmail.com> - 2013-05-23 16:04 +1000
        Re: Newbie question about evaluating raw_input() responses Terry Jan Reedy <tjreedy@udel.edu> - 2013-05-23 03:11 -0400
        Re: Newbie question about evaluating raw_input() responses Chris Angelico <rosuav@gmail.com> - 2013-05-23 17:20 +1000
          Re: Newbie question about evaluating raw_input() responses Nobody <nobody@nowhere.com> - 2013-05-25 19:27 +0100
            Re: Newbie question about evaluating raw_input() responses Chris Angelico <rosuav@gmail.com> - 2013-05-26 04:33 +1000
            Re: Newbie question about evaluating raw_input() responses Fábio Santos <fabiosantosart@gmail.com> - 2013-05-25 23:11 +0100
      Re: Newbie question about evaluating raw_input() responses Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-05-23 18:51 -0400

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