Re: Input() in Python3

From	Mel <mwilson@the-wire.com>
Newsgroups	comp.lang.python
Subject	Re: Input() in Python3
Followup-To	comp.lang.python
Date	2011-04-22 10:08 -0400
Organization	Aioe.org NNTP Server
Message-ID	<ios24t$k72$1@speranza.aioe.org> (permalink)
References	<I89sp.39115$yp3.5013@newsfe09.iad> <BANLkTimJ3ZXNK_0jk_yeinmUNo8s1aQfSw@mail.gmail.com> <mailman.746.1303480346.9059.python-list@python.org>

Followups directed to: comp.lang.python

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Westley Martínez wrote:
> On Fri, Apr 22, 2011 at 04:49:19PM +1000, Chris Angelico wrote:

>> 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.

But sys.exit() doesn't return a string.  My fave is

Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) 
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> a = int (input ('enter a number >'))
enter a number >sys.setrecursionlimit(1)
Exception RuntimeError: 'maximum recursion depth exceeded while calling a 
Python object' in <type 'exceptions.RuntimeError'> ignored
Exception RuntimeError: 'maximum recursion depth exceeded while calling a 
Python object' in <type 'exceptions.RuntimeError'> ignored
Error in sys.excepthook:
RuntimeError: maximum recursion depth exceeded

Original exception was:
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RuntimeError: maximum recursion depth exceeded while calling a Python object
>>> int (0)
Exception RuntimeError: 'maximum recursion depth exceeded while calling a 
Python object' in <type 'exceptions.RuntimeError'> ignored
Exception RuntimeError: 'maximum recursion depth exceeded while calling a 
Python object' in <type 'exceptions.RuntimeError'> ignored
Error in sys.excepthook:
RuntimeError: maximum recursion depth exceeded

Original exception was:
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RuntimeError: maximum recursion depth exceeded while calling a Python object
>>> 


	Mel.

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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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