Error: nodename nor servname provided, or not known (python sockets) -


i trying learn how use sockets using tutorial:
https://www.tutorialspoint.com/python/python_networking.htm
have copied code site directory , ran done in tutorial got errors. here code tutorial.

#!/usr/bin/python           # server.py file  import socket               # import socket module  s = socket.socket()         # create socket object host = 'localhost' # local machine name port = 12345                # reserve port service. s.bind((host, port))        # bind port  s.listen(5)                 # wait client connection. while true:     c, addr = s.accept()     # establish connection client.     print("asdf")     c.send('thank connecting')     c.close()                # close connection

and client.py

#!/usr/bin/python           # client.py file  import socket               # import socket module  s = socket.socket()         # create socket object host = socket.gethostname() # local machine name port = 12345                # reserve port service.  s.connect((host, port)) print s.recv(1024) s.close                     # close socket when done

these console commands ran: 

python server.py & python client.py

i got errors after running command:

traceback (most recent call last):   file "client.py", line 9, in <module>     s.connect((host, port))   file     "/system/library/frameworks/python.framework/versions/2.7/lib/python2.7/soc    ket.py", line 228, in meth return getattr(self._sock,name)(*args) socket.gaierror: [errno 8] nodename nor servname provided, or not known

in case helpful, version of python using python 2.7.10 , use mac version 10.12.6

thanks in advance

from docs of socket.gethostname:

return string containing hostname of machine python interpreter executing.

note: gethostname() doesn’t return qualified domain name; use getfqdn() that.

the host ip not same hostname. have couple of options:

  1. you can either manually assign host 0.0.0.0 or localhost

  2. you can query socket.gethostbyname:

    host = socket.gethostbyname(socket.gethostname()) # or socket.getfqdn() if former doesn't work

Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj...
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer ...
Read more

c# - Asp.net web api : redirect unauthorized requst to forbidden page -

im trying redirect unauthorized request forbidden page instead i'm getting forbidden page in response body , how can fix ? here's startup class : app.createperowincontext(storecontext.create); app.createperowincontext<applicationusermanager>(applicationusermanager.create); app.createperowincontext<applicationsigninmanager>(applicationsigninmanager.create); app.usecookieauthentication(new cookieauthenticationoptions { authenticationtype = defaultauthenticationtypes.applicationcookie, expiretimespan = timespan.fromdays(30), }); app.useexternalsignincookie(defaultauthenticationtypes.externalcookie); app.usetwofactorsignincookie(defaultauthenticationtypes.twofactorcookie, timespan.fromminutes(5)); app.usetwofactorrememberbrowsercookie(defaultauthenticationtypes.twofactorrememberbrowsercookie); the method im trying reach : [httpget] [authorize(roles = "admin")] public string getcurrentusername() { return userman...
Read more