Socket: does not pass when no received data.

[PythonFreak]

Hello, I am trying to make code with the socket, My goal is keep going looping without to wait for input form the socket. here my code:

import socket

v = 0

def readnet():
    if conn:
        r = conn.recv(1024)
        if not r:
            pass
        else:
            y = r.decode("utf-8")
            print("DEF READ: ", end='')
            print(y)
    if not conn:
        print("disconnected")
        return
    return (str(y))

def writenet(x):
    if conn:
        conn.sendall(x.encode("utf-8"))
        print("DEF WRITE: ", end='')
        print(x)
    if not conn:
        print("disconnected")
        return
    return

s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(("192.168.1.200",1234))
s.listen()
conn, addr = s.accept()
s.setblocking(0)
print(f"Connected by {addr} has been established!")
blank=readnet()
writenet("HANDSHAKED")

while conn:
    v=v+1
    print(v)
    blank=readnet()    

print("disconnected")
conn.close()
print("FINISHED")

You see with 'v' value and print too, I want it keep numbers up while it's looping but the "readnet()" stuck and wait for input.
any make it pass when no data?
thanks!

[deanhystad]

Set the socket to non blocking

[PythonFreak]

Ah, I figured out and finally worked. here is

import socket
import select
import time

v = 0

def readnet():
    if conn:
        try:
            r = conn.recv(1024)
        except TimeoutError:
            return ""
        if not r:
            return
        else:
            y = r.decode("utf-8")
            print("DEF READ: ", end='')
            print(y)
    if not conn:
        print("disconnected")
        return
    return (str(y))

def writenet(x):
    if conn:
        conn.sendall(x.encode("utf-8"))
        print("DEF WRITE: ", end='')
        print(x)
    if not conn:
        print("disconnected")
        return
    return

s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(("192.168.1.200",1234))
s.listen()
conn, addr = s.accept()
s.setblocking(0)
conn.settimeout(0.1)
print(f"Connected by {addr} has been established!")
time.sleep(1)
blank=readnet()
writenet("HANDSHAKED")

while conn:
    v=v+1
    blank=readnet()
    if blank is None:
        print("loop ended")
        break
    if v == 10:
        writenet("read")
    if v == 20:
        writenet("write")
        v=0

print("disconnected")
conn.close()
print("FINISHED")

thanks anyway

[PythonFreak]

Set the socket to non blocking

Yeah see #33 at above code.