python socket programming OSError: [WinError 10038] an operation was attempted on something that is not a socket

Question

I am working on this code

from socket import *
HOST = 'localhost'
PORT = 21567
BUFSIZ = 1024
ADDR = (HOST, PORT)
serversock = socket(AF_INET, SOCK_STREAM)
serversock.bind(ADDR)
serversock.listen(2)

while 1:
    print ("waiting on connection")
    clientsock, addr = serversock.accept()
    print ('connected from:', addr)
    while 1:
        data = clientsock.recv(1024).decode()
        if not data: break 
        clientsock.send(data.encode())
        clientsock.close()

serversock.close()

I get this error:

OSError: [WinError 10038] an operation was attempted on something that is not a socket

Does it tell you what line the error is on? Is there any other info you can post to give an idea what's going on, what you're trying to do, aside from create a network connection? — Lizz
– Lizz, Commented Mar 4, 2013 at 20:31
i got this error when running flask from cmd within PyCharm. Switched to Windows CMD Window and the error is gone. — Andrey Bulezyuk
– Andrey Bulezyuk, Commented May 5, 2020 at 9:48
I got this error when trying to run flask in a separate process. I get this error regardless if I run within PyCharm or from Windows cmd prompt. Running flask as a blocking process in Pycharm works fine for me. — Axel Bregnsbo
– Axel Bregnsbo, Commented Apr 19, 2023 at 14:36

Remi Guan · Accepted Answer · 2015-12-04 06:31:23Z

28

You are closing the clientsock after reading only part of the data.

clientsock.close()

is at the wrong level of indentation. Move it to the left by one step.

edited Dec 4, 2015 at 6:31

Remi Guan

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answered Mar 4, 2013 at 20:12

Robᵩ

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2 Comments

Michael Ghorb Over a year ago

i wonder why that line (connection close) is executed while previous line (send data) execution is not completed!

darthmorf Over a year ago

@MohammadGhorbani a bit late, but it's because the clientsock.send() is non-blocking; it doesn't wait for that function to complete before moving on (I think).

zad fab · Accepted Answer · 2021-03-30 14:51:05Z

3

The problem is with close(). after connection get close you need to initialize the connection again

add this line inside while loop

serversock = socket(AF_INET, SOCK_STREAM)

answered Mar 30, 2021 at 14:51

zad fab

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Comments

user1438233 · Accepted Answer · 2022-08-09 15:18:16Z

-3

Besides the close problem, you need to run:

WSADATA wsaData;
WSAStartup(MAKEWORD(2, 2), &wsaData);

before the call to socket

answered Aug 9, 2022 at 15:18

user1438233

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1 Comment

Edward Spencer Over a year ago

can you explain why? also that looks like the wrong language, the question was about python

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