Exception handling for socket.error in Python 3.5/RStudio

Shaunak Bangale shaunak.bangale at gmail.com
Fri Feb 5 15:50:58 EST 2016


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
#context.load_default_certs()

ssl_sock = context.wrap_socket(s, server_hostname ='firehose.flightaware.com
')
print("Connecting...")
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:
        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
ssl_sock.close()

----------

Error:
except socket.error as e:
                         ^
SyntaxError: invalid syntax


TIA.





On Fri, Feb 5, 2016 at 1:44 PM, Martin A. Brown <martin at linux-ip.net> wrote:

>
> 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
> >ssl_sock.close()
> >
> >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.
>
>   * When you catch the error in the above, you print the traceback
>     information, but your loop will continue.  Is that what you
>     desired?
>
> 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
> email.
>
> Best of luck,
>
> -Martin
>
> --
> Martin A. Brown
> http://linux-ip.net/
>


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