Python, TCP, Server and client - python-3.x

Question

I have problem with TCP (Server and Client.) over python3.
What does i do wrong?
my code is in TCP Server:
import socket
server = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
ip = socket.gethostbyname("127.0.0.1")
port = 8892
address=(ip,port)
server.bind(address)
server.listen(1)
print("[*] Started listening on" , ip, ":", port)
client,addr = server.accept()
print("[*] Got Connection from", addr[0], ":", addr[1])
while True:
data = client.recv(1024)
data = data.decode('utf-8')
print("[*] Received ", data, " from the client")
print("[*] Processing data")
if data == "hello":
client.send("Hello client")
print("[*] Processing done\n[*] Reply sent")
elif data == "disconnect":
client.send("Goodbye")
client.close()
break
else:
client.send("Invalid type")
print("Processing done Invalid data \n[*] Reply sent")
my code is in TCP Client:
import socket
client=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
ip = socket.gethostbyname("127.0.0.1")
print(ip)
port=8892
address=(ip,port)
client.connect(address)
while True:
message = input()
client.send(message.encode('utf-8'))
print(client.recv(1024))
Erorr message:
Traceback (most recent call last): File "tcpServer.py", line 25, in
client.send("Invalid type") TypeError: a bytes-like object is required, not 'str'
Can some one help me please, what can i do?
Thanks for helping me. :)

Answer 1

in python 3 you are no more sending/reading characters or string, but byte-array (or bytes).
You might also need to manage encoding (utf-8 <-> bytes).
ex:
>>> s = "énorme"
>>> b = s.encode("utf-8")
>>> b
b'\xc3\xa9norme'
and use the bytes.decode() to reverse it.
For your very trivial case, you can use direcly bytes string as b"hello", as plain ASCII string are converted "as-is" to bytes.
client.send("Hello client") will become client.send(b"Hello client")
But don't go too deeper with this solution.
I personally allow this usage when using commands to talk to some hardware, but absolutely not for a chat or text exchange.