[Tutor] exceptions problem

[Luke Paireepinart]

Roleof, do you think you could stop sending HTML messages and use
plaintext instead?  I usually skip over your posts because your font
is so small and hard to read that I don't even bother.
If you send plain-text messages (which is the norm on programming
mailing lists) then you leave it up to the e-mail client to render the
text.

Yes, I could turn off HTML on my end, but that is a pain and breaks
messages that I legitimately want to be HTML.

Thanks,
-Luke

On Fri, Sep 10, 2010 at 6:56 PM, bob gailer <bgailer at gmail.com> wrote:
> On 9/10/2010 2:48 PM, Roelof Wobben wrote:
>
>
> Date: Fri, 10 Sep 2010 20:23:09 +0200
> From: fal at libero.it
> To: tutor at python.org
> Subject: Re: [Tutor] exceptions problem
>
> On 10/09/2010 18.12, Roelof Wobben wrote:
>> ...
>> def readposint():
>>         x = raw_input("Please enter a positive integer :")
>>         try:
>>               if not (x == int(x) and x<  0): raise(ValueError)
>>         except:
>>                 print x , "is not a positive integer.    Try again."
>>                 return False
>>         return True
>>
>> y = readposint()
>> print y
>> while y == False:
>>         readposint()
>> print "You have entered : ", y
>>
>> But -9 and 2 are both true.
> My fault, I didn't notice that after raw_input, whatever you enter is a
> STRING, not an integer! So, without any exception thrown, the comparison
> x == int(x) is always False. Let's make it better:
>     if (int(x)<0 or (float(x) - int(x) > 0)): raise(ValueError)
>
>
> Then, if the input value x is indeed a positive integer, you should
> return x, not True or False. Try returning -1 if the exception is
> thrown, in line 7, and returning x in line 8. Then, you should change
> also line 12... ok, here's to you:
>
> def readposint():
>      x = raw_input("Please enter a positive integer :")
>      try:
>          if (int(x)<0 or (float(x) - int(x) > 0)): raise(ValueError)
>      except:
>          print x , "is not a positive integer.    Try again."
>          return -1
>      return x
>
> y = readposint()
> print y
> while y == -1:
>      readposint()
> print "You have entered : ", y
>
>>
>> Roelof
> Francesco
>
> Thank you.
>
> I never thought that you can use a float and a integer to look if the number
> is a integer.
>
> You can't.
>
>
> --
> Bob Gailer
> 919-636-4239
> Chapel Hill NC
>
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