problem with if then

[Jean Dubois]

On 9 jun, 22:00, Fábio Santos <fabiosantos... at gmail.com> wrote:
> On 9 Jun 2013 20:49, "Jean Dubois" <jeandubois... at gmail.com> wrote:
>
>
>
> > I'm writing some code to check whether an url is available or not,
> > therefore I make use of a wget-command in Linux and then check whether
> > this is successful (returning a 0) or not returning an 8
> > However the if then statement seems to give the same result in both
> > cases:
>
> Which result? Failure, or success?
In case of failure I expect it to answer: stream not available
In case of success I expect it to answer: stream is available
But I get a "stream is available" in both cases even though the
command os.system(checkavailablestring) does give different answers: 0
and 8
>Have you tried printing the
> checkavailablestring string and running that command exactly?
yes I did, no problem there
>There may be something wrong with the command or URL in some way, and calling os.system
I have added a line to the script and the results below so you can see
better what's going wrong:

Here's the script once again, this time with an extra line:

#!/usr/bin/env python
import sys
import os
from datetime import datetime, timedelta
today=datetime.now()
yesterday= datetime.now() - timedelta(days=1)
daybeforeyesterday= datetime.now() - timedelta(days=2)
collection = [daybeforeyesterday,yesterday,today]
for thisday in collection:
     checkavailablestring='wget -q -O -
http://www.deredactie.be/cm/vrtnieuws/videozone/programmas/journaal/EP_'+thisday.strftime("%y%m%d")+'_JO7
>/dev/null ; echo $?'
     print checkavailablestring
     if os.system(checkavailablestring)==0:
          print thisday, 'stream is available'
     else:
          print thisday, 'stream is not available'

And here is the result:

jean at antec4:~$ ./try.py
wget -q -O - http://www.deredactie.be/cm/vrtnieuws/videozone/programmas/journaal/EP_130607_JO7
>/dev/null ; echo $?
8
2013-06-07 22:07:00.016807 stream is available
wget -q -O - http://www.deredactie.be/cm/vrtnieuws/videozone/programmas/journaal/EP_130608_JO7
>/dev/null ; echo $?
8
2013-06-08 22:07:00.016795 stream is available
wget -q -O - http://www.deredactie.be/cm/vrtnieuws/videozone/programmas/journaal/EP_130609_JO7
>/dev/null ; echo $?
0
2013-06-09 22:07:00.016763 stream is available