Summary of python socket stream redirection examples

#!/usr/bin/env python3
"""
Testing socket-stream redirection mode
"""
import sys,os,time
from multiprocessing import Process
from socket import *
 
def initListenerSocket(port=50008,host=''):
    """
    Initialize the socket used by the caller in server mode to listen for connections
    """
    sock=socket()
    try:
        ((host,port))
    except OSError as e:
        print('Address already in use')
        os._exit(1)
    (5)
    conn,addr=()
    return conn
 
def redirecOut(port=50008,host='localhost'):
    """
    All other connections fail before acceptance, connecting the caller's standard output stream
    to a socket that is used for gui listening, which starts the caller after the listener has started
    """
    sock=socket()
    try:
        ((host,port))
    except ConnectionRefusedError as e:
        print('connection refuse')
        os._exit(1)
    file=('w')
    =file
    return sock
 
def redirecIn(port=50008,host='localhost'):
    """
    Connects the caller's standard input stream to the socket used to provide the gui.
    """
    sock=socket()
    try:
        ((host,port))
    except ConnectionRefusedError as e:
        print('conenction refuse')
        os._exit(1)
    file=('r')
    =file
    return sock
 
def redirecBothAsClient(port=50008,host='localhost'):
    """
    In this mode, the connection caller streams standard input and output to the same socket
    The caller is a client to the server: sends a message and receives a response in reply
    """
    sock=socket()
    try:
        ((host,port))
    except ConnectionRefusedError as e:
        print('connection refuse')
        os._exit(1)
    ofile=('w')
    ifile=('r')
    =ofile
    =ifile
    return sock
 
def redirecBothAsServer(port=50008,host='localhost'):
    """
    In this mode, the connection caller standard input and output flows to the same socket, and the caller is a server to the
    server is the server side: it accepts messages and sends response replies
    """
    sock=socket()
    try:
        ((host,port))
    except OSError as e:
        print('Address already in use')
        os._exit(1)
    (5)
    conn,addr=()
    ofile=('w')
    ifile=('r')
    =ofile
    =ifile
    return conn
 
def server1():
    mypid=()
    conn=initListenerSocket()
    file=('r')
    for i in range(3):
        data=().rstrip()
        print('server %s got [%s]' %(mypid,data))
 
def client1():
    (1)
    mypid=()
    redirecOut()
    for i in range(3):
        print('client: %s:%s' % (mypid,i))
        ()
 
def server2():
    mypid=()
    conn=initListenerSocket()
    for i in range(3):
        (('server %s got [%s]\n' %(mypid,i)).encode())
 
def client2():
    (1)
    mypid=()
    redirecIn()
    for i in range(3):
        data=input()
        print('client %s got [%s]]'%(mypid,data))
 
def server3():
    mypid=()
    conn=initListenerSocket()
    file=('r')
    for i in range(3):
        data=().rstrip()
        (('server %s got [%s]\n' % (mypid,data)).encode())
 
def client3():
    (1)
    mypid=()
    redirecBothAsClient()
    for i in range(3):
        print('Client %s: %s' %(mypid,data))
        data=input()
        ('client %s got [%s]\n' %(mypid,data))
 
def server4(port=50008,host='localhost'):
    mypid=()
    sock=socket()
    try:
        ((host,port))
    ConnectionRefusedError as e:
        print('connection refuse')
        os._exit(1)
    file=('r')
    for i in range(3):
        (('server %s: %S\n' %(mypid,i)).encode())
        data=().rstrip()
        print('server %s got [%s]' %(mypid,data))
 
def client4():
    (1)
    mypid=()
    redirecBothAsServer()
    for i in range(3):
        data=input()
        print('client %s got [%s]'%(mypid,data))
        ()
 
def server5():
    mypid=()
    conn=initListenerSocket()
    file=('r')
    for i in range(3):
        (('server %s:%s\n' %(mypid,i)).encode())
        data=().rstrip()
        print('server %s got [%s]' % (mypid,data))
 
def client5():
    mypid=()
    s=redirecBothAsClient()
    for i in range(3):
        data=input()
        print('client %s got [%s]'%(mypid,data))
        ()
 
def main():
    server=eval('server'+[1])
    client=eval('client'+[1])
    Process(target=server).start()
    client()
 
if __name__=='__main__':
    main()