用多執行緒，實現併發，TCP

首先，開啟新的執行緒，是不會新開闢記憶體空間的，即，子執行緒和主執行緒 都在同一個程式裡，也就是主程式裡，用os.pid(),os.ppid()

伺服器：
方式一：Thread例項化

def task(conn, addr):
    # print(os.getpid())
    # print(os.getppid())
    # print(current_thread().name)
    # print(current_thread().is_alive())
    # print(active_count())
    while True:
        try:
            data = conn.recv(1024)
            if not data:
                print('連線已斷開')
                break
            print('收到客戶端%s第一條資訊%s' % (conn, addr))
            print('資訊為：%s' % data.decode('utf-8'))
            conn.send('good'.encode('utf-8'))
        except Exception:
            print('連線已斷開')
            break


#
#
#
if __name__ == '__main__':
    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server.bind(('127.0.0.1', 6666))
    server.listen(5)
    while True:
        conn, addr = server.accept()
        # print(os.getpid())
        # print(os.getppid())
        t1 = Thread(target=task, args=(conn, addr))
        t2 = Thread(target=task, args=(conn, addr))
        t1.start()
        t2.start()

服務端：
方拾二：自定義子類，繼承Thread，__init__可以新增新的屬性，要在run裡，實現你的一些函式，把引數傳進去。

def task(conn, addr):
    # print(os.getpid())
    # print(os.getppid())
    # print(current_thread().name)
    # print(current_thread().is_alive())
    # print(active_count())
    while True:
        try:
            data = conn.recv(1024)
            if not data:
                print('連線已斷開')
                break
            print('收到客戶端%s第一條資訊%s' % (conn, addr))
            print('資訊為：%s' % data.decode('utf-8'))
            conn.send('good'.encode('utf-8'))
        except Exception:
            print('連線已斷開')
            break

class Mythread(Thread):
    def __init__(self, task, args):
        super().__init__(target=task, args=args)

    def run(self):
        task(conn, addr)


if __name__ == '__main__':
    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server.bind(('127.0.0.1', 6666))
    server.listen(5)
    while True:
        conn, addr = server.accept()
        t1 = Mythread(task=task, args=(conn, addr))
        t1.start()