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leke
LXF regular
Joined: Mon Oct 22, 2007 6:45 pm
Posts: 479
Location: Oulu, Finland
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 Posted: Mon Feb 15, 2010 11:44 am Post subject: Python WHILE problem |
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Hi, I'm having some problems testing for false. If the code below doesn't connect to http://www.rssweather.com/wx/fi/pirkkala/rss.php , (for example, you are offline) it returns an error. I tested the error value with an IF conditional which seemed to return FALSE for fd.entries, so I tried to code a WHILE loop to keep trying until fd.entries returned TRUE. Here is a simplified version of my code...
| Code: | #!/usr/bin/env python
# -*- coding: utf-8 -*-
import feedparser
df = feedparser.parse('http://www.rssweather.com/wx/fi/pirkkala/rss.php')
while (df.entries == False):
df = feedparser.parse('http://www.rssweather.com/wx/fi/pirkkala/rss.php')
else:
rss_feed_summary = str(df.entries[0].summary)
rss_feed_time = str(df.entries[0].updated)
sms = rss_feed_summary+"\n"+rss_feed_time
print sms |
If I go offline and run this, I get...
leke@leke ~/Desktop/saunasms_src $ python fpTest.py
Traceback (most recent call last):
File "fpTest.py", line 11, in <module>
rss_feed_summary = str(df.entries[0].summary)
IndexError: list index out of range
...If I go online, everything works as expected.
What am I doing wrong here? |
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LeeNukes
LXF regular
Joined: Sun Jun 21, 2009 9:11 pm
Posts: 954
Location: At the bar
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| Posted: Mon Feb 15, 2010 2:22 pm Post subject: |
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Am I right in thinking that you've set it so that whilst the link isn't available, go and get the link?
Won't that slow it down a bit for it to constantly check for the .rss to be available?
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nelz
Moderator
Joined: Mon Apr 04, 2005 12:52 pm
Posts: 8002
Location: Warrington, UK
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| Posted: Mon Feb 15, 2010 2:35 pm Post subject: |
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A time.sleep call in the while loop would help, then put print df at the start of the else clause to see what see it df is actually a list.
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leke
LXF regular
Joined: Mon Oct 22, 2007 6:45 pm
Posts: 479
Location: Oulu, Finland
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| Posted: Mon Feb 15, 2010 3:01 pm Post subject: |
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| LeeNukes wrote: | | Am I right in thinking that you've set it so that whilst the link isn't available, go and get the link? |
Yes, for some reason whilst online, the link isn't available sometimes. This is quite disastrous since the script is run on the server once a day.
| LeeNukes wrote: | | Won't that slow it down a bit for it to constantly check for the .rss to be available? |
I guess it would. Hey, how about a timer  
| Code: | while (df.entries == False):
time.sleep(10)
print df
df = feedparser.parse('http://www.rssweather.com/wx/fi/pirkkala/rss.php')
else:
rss_feed_summary = str(df.entries[0].summary)
rss_feed_time = str(df.entries[0].updated) |
I added that timer and the print statement. But weirdly enough, I get the same error with no time delay and nothing printed. Does this mean python doesn't see df.entries as false? |
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leke
LXF regular
Joined: Mon Oct 22, 2007 6:45 pm
Posts: 479
Location: Oulu, Finland
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| Posted: Mon Feb 15, 2010 3:04 pm Post subject: |
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whoops, I see you said at the start of the else condition. This is what I get...
leke@leke ~/Desktop/saunasms_src $ python fpTest.py
{'feed': {}, 'encoding': 'utf-8', 'bozo': 1, 'version': None, 'entries': [], 'bozo_exception': URLError(gaierror(-2, 'Name or service not known'),)}
Traceback (most recent call last):
File "fpTest.py", line 15, in <module>
rss_feed_summary = str(df.entries[0].summary)
IndexError: list index out of range
If I ran df.entries i would get [] back in return. |
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leke
LXF regular
Joined: Mon Oct 22, 2007 6:45 pm
Posts: 479
Location: Oulu, Finland
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| Posted: Mon Feb 15, 2010 3:43 pm Post subject: |
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W00t, we cracked it guys. I messed up my False testing. Adding while (not df.entries): made it recognise that it was false and to run the true condition sequence.
Thanks  I hope that works out a little better. If you are interested, here is the original script...
| Code: | #!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys
import time
import urllib2, cookielib, re
import feedparser
df = feedparser.parse('http://www.rssweather.com/wx/fi/pirkkala/rss.php')
rss_feed_summary = str(df.entries[0].summary)
rss_feed_time = str(df.entries[0].updated)
sms = rss_feed_summary+"\n"+rss_feed_time # Message to send.
username = "" # Oma.Saunalahti account (your phonenumber in format 045...)
password = "" # Oma.Saunalahti account password
sender = "" # Your Saunalahti number (your phonenumber in format 045...)
recipients = "" # Receivers phone number (phonenumber in format 045...)
u = 'https://oma.saunalahti.fi/settings/smsSend'
d = r"username="+username+r"&login=Sisään&password="+password
c = cookielib.CookieJar()
o = urllib2.build_opener(urllib2.HTTPCookieProcessor(c))
o.addheaders = [('Referer', 'https://oma.saunalahti.fi/settings/'),
('Content-Type', 'application/x-www-form-urlencoded'),
('User-Agent', 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14')]
s = o.open(u, d)
p = s.read()
s.close()
d = "sender="+sender+"&recipients="+recipients+"&text="+sms+"&size="+str(len(sms))+"&send=Lähetä"
s = o.open(u,d)
d = s.read()
s.close()
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