Q:

KeyError: 'fullcount' in mail script

I wrote a Python script to check my email and turn on an LED when I have new mail.
After about 1 hour, I got the error: 
Traceback (most recent call last):
  File "checkmail.py", line 10, in <module>
   B = int(feedparser.parse("https://" + U + ":" + P + "@mail.google.com/gmail/feed/atom")["feed"]["fullcount"])
  File "/usr/local/lib/python2.7/dist-packages/feedparser.py", line 375, in __getitem__
    return dict.__getitem__(self, key)
KeyError: 'fullcount'

I looked here
and didn't find an answer. Here is my code: 
#!/usr/bin/env python
import RPi.GPIO as GPIO, feedparser, time
U = "username"
P = "password"
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
A = 23
GPIO.setup(A, GPIO.OUT)
while True:
        B = int(feedparser.parse("https://" + U + ":" + P + "@mail.google.com/gmail/feed/atom")["feed"]["fullcount"])
        if B > 0:
                GPIO.output(A, True)
        else:
                GPiO.output(A, False)
        time.sleep(60)

I'm running this on a Raspberry Pi.
Thanks in advance for any help.

A:

You need to add some debug code and see what this call returns:
feedparser.parse("https://" + U + ":" + P + "@mail.google.com/gmail/feed/atom")["feed"]

It's clearly something that does not contain a "fullcount" item. You might want to do something like this:
feed = feedparser.parse("https://{}:{}@mail.google.com/gmail/feed/atom".format(U, P))
try:
    B = int(feed["feed"]["fullcount"])
except KeyError:
    # handle the error
    continue  # you might want to sleep or put the following code in the else block

That way you can deal with the error (you might want to catch ValueError too, in case int() fails because of an invalid value) without it blowing up your script.

