Try problem

[Bruno Desthuilliers]

mik3l3374 at gmail.com a écrit :
> On Apr 13, 5:14 pm, "SamG" <mad.vi... at gmail.com> wrote:
>> import sys
>> try:
>>      s=1
>>      if s==1:
>>           sys.exit(0)
>>      else:
>>           sys.exit(1)
>> except SystemExit,s:
>>      if (s==0):
>>           print s
>>      else:
>>           print "Hello"
>>
>> How come i always end up getting the "Hello" printed on the screen as
>> logically i should a '0' printed?
> 
> 
> if you put a debug print statement, eg
> 
> ...
> except SystemExit,s:
>     print "s in exception " , s, type(s)
>     if (s==0):
> ....
> 
> you will notice 's' is an "instance".

Not with Python 2.5.x (exceptions are now new-style classes too).

> so when it reaches the if
> (s==0), which you are comparing with a number,

Actually, with an instance of class int. Everything in Python is an object.

But the comparison will fail, indeed.