python implements point to point chat programs

With Python to achieve point-to-point chat, two procedures, one is client. py, one is server. py, through the local address 127.0.0.1 connection for communication, the use of multithread to send messages and receive messages separate independently.

client code:

import socket
import sys
import threading
import time
 
class client():
 def __init__(self):
  self.s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
  self.ip = "127.0.0.1"
 
 def connect(self):
  try:
   self.s.connect((self.ip,8888))
   print("connect success")
   print('connect time: '+time.ctime())
  except ConnectionError:
   print('connect error')
   sys.exit(-1)
  except:
   print('unexpect error')
   sys.exit(-1)
 
 def send_sth(self):
  while True:
   sth=input('say something:\n')
   try:
    self.s.sendall(sth.encode('utf-8'))
   except ConnectionError:
    print('connect error')
    sys.exit(-1)
   except:
    print('unexpect error')
    sys.exit(-1)
 
 def receive(self):
  while True:
   try:
    r=self.s.recv(1024)
    print ('get message:'+r.decode('utf-8'))
   except ConnectionError:
    print('connect error')
    sys.exit(-1)
   except:
    print('unexpect error')
    sys.exit(-1)
 
c1 = client()
c1.connect()
threading._start_new_thread(c1.receive,())
c1.send_sth()

server code:

import socket
import sys
import threading
import time
 
def server():
 def bind():
  HOST='127.0.0.1'
  s.bind((HOST,8888))
  print("bind ok")
 
 def listen():
  s.listen(10)
  print ('Socket now listening')
 
 def send_sth(conn):
  while True:
   try:
    sth=input('say something:\n')
    conn.sendall(sth.encode('utf-8'))
   except ConnectionError:
    print('connect error')
    sys.exit(-1)
   except:
    print('unexpect error')
    sys.exit(-1)
 
 def recv(conn):
   while True:
   try:
    data=conn.recv(1024)
    data2=data.decode('utf-8')
    print('get message:'+data2)
   except ConnectionError:
    print('connect error')
    sys.exit(-1)
   except:
    print('unexpect error')
    sys.exit(-1)
 
 s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
 bind()
 listen()
 conn,addr=s.accept()
 print("connect success")
 print('connect time: '+time.ctime())
 threading._start_new_thread(recv,(conn,))
 send_sth(conn)
 
if __name__=='__main__':
 server()

There are two ways to turn on multithreading, both using functions, and one way to inherit from threading classes

Code:

import socket
import threading
class client(threading.Thread):
 def __init__(self,sth):
  threading.Thread.__init__(self)
  self.sth=sth
 def run(self):
  s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
  ip="127.0.0.1"
  try:
   s.connect((ip,8888))
  except :
   print('con error')
   exit()
  #print("connect success")
  s.sendall(self.sth.encode('utf-8'))
  #print("send success")
  try:
   r=s.recv(1024)
  except:
   print('recv error')
   exit()
  print (r.decode('utf-8'))
c1=client('hello 1')
c1.start()
c2=client('hello 2')
c2.start()