On 15/10/12 05:05, Norman Khine wrote:
for page_no in pages:
[...]
try:
urllib2.urlopen(req)
except urllib2.URLError, e:
pass
else:
# do something with the page
doc = urllib2.urlopen(req)
This is a bug. Just because urlopen(req) succeeded a moment ago, doesn't mean
that it will necessarily succeed now.
This is an example of the general class of bug known as a "race condition":
http://en.wikipedia.org/wiki/Race_condition
Better to write this as:
try:
doc = urllib2.urlopen(req)
except urllib2.URLError, e:
pass
else:
# do something with the page
[rest of code goes here]
--
Steven
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