使用 socket.recv 检查传入的数据类型

Question

I need my program to know if the message from the client is a number, so int or float, or a string.

Until now, my program look like this:

    def handle_client_text(conn, addr):
    print(f"[NEW CONNECTION] {addr} connected.")
    
    connected = True
    while connected:
            msg_lenght = conn.recv(HEADER).decode(FORMAT)
            if msg_lenght:
                msg_lenght = int(msg_lenght)
                msg = conn.recv(msg_lenght).decode(FORMAT)
                if msg == DISCONNECT_MESSAGE:
                    connected = False
                    conn.close()
                    print ("disconnecting")
                print(f"[{addr}] {msg}")
            
        sleep(0.001)
    
def start():
    server.listen()
    print(f"[LISTENING] Server is listening on {SERVER}")
    while True:
        conn, addr = server.accept()
        thread = threading.Thread(target=handle_client_text, args=(conn, addr))
        thread.start()
        print(f"[ACTIVE CONNECTIONS] {threading.activeCount() - 1}")

I need that it can receive numbers other than strings, and that it acts in a different way if its a number or a string.

Every variable that isn't defined here is defined in another part of the code.

Answer 1

Data that are coming via socket is in byte form, and it becomes a string when you decode() it and becomes int or float if you convert it with int() or float() respectively.

Hence, if you want to have different logic based on its datatype, You should either check for all digits/dots or alphanumeric characters to classify between numeric and string datatypes. or, If you may have to treat "12" as string instead of int, send data type as meta data from client.