Exception handling for socket.error in Python 3.5/RStudio
shaunak.bangale at gmail.com
Fri Feb 5 16:00:26 EST 2016
Answering your questions below:
On Fri, Feb 5, 2016 at 1:50 PM, Shaunak Bangale <shaunak.bangale at gmail.com>
> Hi Martin,
> Thanks for the detailed reply. I edited, saved and opened the file again.
> Still I am getting exactly the same error.
> Putting bigger chunk of code and the error again:
> # create socket
> s = socket.socket(socket.AF_INET)
> #create a SSL context with the recommended security settings for client
> sockets, including automatic certificate verification:
> context = ssl.create_default_context()
> # Alternatively, a customized context could be created:
> #context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
> #context.verify_mode = ssl.CERT_REQUIRED
> #context.check_hostname = True
> # Load a set of default CA certificates from default locations
> ssl_sock = context.wrap_socket(s, server_hostname ='
> ssl_sock.connect(('firehose.flightaware.com', 1501))
> print("Connection succeeded")
> # send initialization command to server:
> ssl_sock.write(bytes(initiation_command, 'UTF-8'))
> # return a file object associated with the socket
> file = ssl_sock.makefile('r')
> # use "while True" for no limit in messages received
> count = 10
> while (count > 0):
> try :
> # read line from file:
> # parse
> count = count - 1
> except socket.error as e:
> print('Connection fail', e)
> # wait for user input to end
> # input("\n Press Enter to exit...");
> # close the SSLSocket, will also close the underlying socket
> except socket.error as e:
> SyntaxError: invalid syntax
> On Fri, Feb 5, 2016 at 1:44 PM, Martin A. Brown <martin at linux-ip.net>
>> Hi there Shaunak,
>> I saw your few replies to my (and Nathan's) quick identification of
>> syntax error. More comments follow, here.
>> >I am running this python script on R-studio. I have Python 3.5 installed
>> on my system.
>> >count = 10
>> >while (count > 0):
>> > try :
>> > # read line from file:
>> > print(file.readline())
>> > # parse
>> > parse_json(file.readline())
>> > count = count - 1
>> > except socket.error as e
>> > print('Connection fail', e)
>> > print(traceback.format_exc())
>> ># wait for user input to end
>> ># input("\n Press Enter to exit...");
>> ># close the SSLSocket, will also close the underlying socket
>> >The error I am getting is here:
>> >line 53 except socket.error as e ^ SyntaxError: invalid syntax
>> >I tried changing socket.error to ConnectionRefusedError. and still got
>> the same error.
>> We were assuming that line 53 in your file is the part you pasted
>> above. That clearly shows a syntax error (the missing colon).
>> If, after fixing that error, you are still seeing errors, then the
>> probable explanations are:
>> * you are not executing the same file you are editing
>> * there is a separate syntax error elsewhere in the file (you sent
>> us only a fragment)
>> Additional points:
>> * While the word 'file' is not reserved in Python 3.x, it is in
>> Python 2.x, so, just be careful when working with older Python
>> versions. You could always change your variable name, but you
>> do not need to.
>> But according to FlighAware, this code is supposed to work on the Python
3.X and I have Python 3.5 on my computer and I am hoping the same is being
used by Rstudio.
> * When you catch the error in the above, you print the traceback
>> information, but your loop will continue. Is that what you
>> Yes, I want the loop to run 10 times.
> I might suggest saving your work carefully and make sure that you
>> are running the same code that you are working on. Then, if you
>> are still experiencing syntax errors, study the lines that the
>> interpreter is complaining about. And, of course, send the list an
>> The same code is supposedly running on a mac machine- Rstudio. I am not
sure if the issue is also with Windows 7- Rstudio- Python 3.5 combo.
> Best of luck,
>> Martin A. Brown
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