On Sunday, September 20, 2015 at 8:11:18 PM UTC+5:30, Laura Creighton wrote: > The discussion about why or why not to use a bare except has gotten us > away from the problem reported, which is "why is my script hanging?" > > In a message of Sat, 19 Sep 2015 17:18:12 +0100, Mark Lawrence writes: > >> I am learning python. I wrote a script using requests module. > >> The scripts runs fine for sometime, but after a while it hangs. When I > >> press CTRL+C it shows ConnectionError even though I have included > >> exception handling. > >> I am not sure as to why it cant handle ConnectionError when the script > >> runs for a long time. > >> > >> This is a part(causing issues) of the script I am running: > >> > >> while(k<46656): > >> j=res[k] > >> url="http://172.16.68.6:8090/login.xml"; > >> query_args = {'mode':'191', 'username':str(i), > >> 'password':str(j), 'a':'1442397582010', 'producttype':'0'} > >> > >> try: > >> r=requests.post(url, data=query_args) > >> except: > >> print "Connection error" > >> time.sleep(30) > >> continue > >> > >> html=r.text > >> if(len(html) < 10): > >> continue > >> > >> if("The system could not log you on" not in html): > >> print "hello" > >> filehandle=open("ids", "a") > >> filehandle.write(str(i)+'\n') > >> filehandle.write(str(j)+'\n') > >> filehandle.close() > >> break > >> > >> k=k+1 > >> > >> Any help will be highly appreciated. > > So, when it hangs there are two main problems you can have. One sort > is that the other side, http://172.16.68.6:8090/ it in itself > configured to only let people use a connection for a certain amount of > time. If you are using it for longer, it will disconnect you. Or the > other sort is that the other side disconnects people who have been > silent for a certain amount of time. If you haven't send anything for > a certain amount of time it will log you off. There are lots of other > things that work this way -- the system may see many attempts to login > and think you are trying to break into the system, the machine may > have crashed ... but the bottom line is that the reason your script > hangs is that there is nobody there on the other end. > > The other sort of problem you can have is that the other end is > alive and well and talking to you, but you don't understand what > you are getting, and you are ignoring things you don't understand. > This can look exactly the same. > > To find out what is going on you need to log what it is that you > are getting, to see if the answer is 'nothing' or 'garbage'. > > Laura
Hi If my script hangs because of the reasons you mentioned above, why doesnt it catch ConnectionError? My script stops for a while and when I press CTRL+C, it shows ConnectionError without terminating the process, and the script resumes from where it left off. -- https://mail.python.org/mailman/listinfo/python-list
