[sf-lug] ThinkPython: coding problem

[Tom Haddon]

On Sat, 2008-10-11 at 20:59 -0700, Alex Kleider wrote:
> Thanks to Jeff and Jim.
> I googled python exceptions
> and solved my problem using the 
> try:
>   pass
> except:
>   pass
> construct and everything works just fine.

Just a quick note - I'd recommend against ever using "except" on its own
without the specific error you're expecting. In this case, if n is a
string, for example, you'll get a ValueError, so it would be better to
do:

try:
  value = int(n)
except ValueError:
  return False

The reason you don't want an unqualified "except" is that you may not be
catching the error you thing you're catching without it.

Cheers, Tom

> 
> fyi:
> 
> def int_check(n):
>   try:
>     value=int(n)        
>   except: 
>     return False
>   if type(value)==int:
>     return True
>   else:
>     return False
> 
> def get (check, prompt, moan):
>   response=raw_input(prompt)
>   if check(response):
>     return int(response)
>   else:
>     print moan
>     return get (check,prompt,moan)
> 
> # main body
> preamble()
> a=get(int_check,'Enter a: ','Problem! a must be an integer. Try again') 
> 
> 
> 
>       
> 
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