Python socket implements TCP server and client

•        Python : 3.8.11
•          OS : Ubuntu Kylin 20.04
•       Conda : 4.10.1
•     Pycharm : 2021.1.3

Code example

tcp_server

""" @Author :  First intention  @Date : 10/12/21 7:11 PM """
import socket
import threading


def client_handle(client):
    message = client.recv(1024)
    print("message", message)
    client.send("server accept!".encode("utf-8"))
    client.close()


bind_ip = "127.0.0.1"
bind_port = 7778

# socket.AF_INET:  Network type ,IPv4
# socket.SOCK_STREAM: TCP
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# SOL_SOCKET： In use socket
# socket.SO_REUSEADDR,1 :  More meaning and function , For restart socket_server It can still go smoothly bind
server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

server.bind((bind_ip, bind_port))

#  Number of monitors  3
server.listen(3)

while True:
    client, address = server.accept()
    print("client", client)
    print("address", address)

    client_thread = threading.Thread(target=client_handle, args=(client,))
    client_thread.start()

# This code is unreachable
server.close()

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tcp_client

""" @Author :  First intention  @Date : 10/12/21 7:27 PM """
import socket

server_ip = "127.0.0.1"
server_port = 7778

# socket.AF_INET:  Network type ,IPv4
# socket.SOCK_STREAM： TCP  client 
client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

client.connect((server_ip, server_port))

# TypeError: a bytes-like object is required, not 'str'
# client.send("hello world")

client.send("hello world".encode("utf-8"))

response = client.recv(1024)
print(response)

client.close()

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Running effect

tcp_server

• Use IDE Forcibly ended tcp_server, So there will be KeyboardInterrupt

/home/coder/anaconda3/envs/py38/bin/python /home/coder/PycharmProjects/pythonProject1/tcp_server.py
client <socket.socket fd=4, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 7778), raddr=('127.0.0.1', 45876)>
address ('127.0.0.1', 45876)
message b'hello world'
Traceback (most recent call last):
  File "/home/coder/PycharmProjects/pythonProject1/tcp_server.py", line 33, in <module>
    client, address = server.accept()
  File "/home/coder/anaconda3/envs/py38/lib/python3.8/socket.py", line 292, in accept
    fd, addr = self._accept()
KeyboardInterrupt

Process finished with exit code 130 (interrupted by signal 2: SIGINT)

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tcp_client

/home/coder/anaconda3/envs/py38/bin/python /home/coder/PycharmProjects/pythonProject1/tcp_client.py
b'server accept!'

Process finished with exit code 0

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Learning recommendations

• Python file - English
• Python file - chinese
• Python standard PEP
• Python standard google edition
• Python Source code
• Python PEP
• You Qilin
• The nuggets platform
• gitee platform

Python Open source 、 Cross platform 、 interpreted 、 Interactive and so on , Worth learning .
Python Philosophy of design ： grace , clear , Simple . Advocate a way , It's better to have only one way to do one thing .
The code should be written according to the standard , It helps to communicate and understand .
Every language has a unique idea , Beginners need to change their thinking 、 Practice steadfastly 、 Keep accumulating .