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I am writing a simple socket app, and I have met this message and don't know how to fix it.

server_input =s.recv(1024)
ConnectionResetError: [Errno 54] Connection reset by peer
server.py
import socket
def main():
    s = socket.socket()
    port = 58257
    client_address = "localhost"
    s.bind((client_address, port)) 
    s.listen(2)
    user_input = input("Enter a message: ")
    s.send(user_input.encode())
    s.close()
if __name__ == '__main__':
    main()
client.py
import socket
def main():
    s = socket.socket()
    #host = socket.gethostname()
    port = 58257
    client_address = "localhost"
    s.connect((client_address, port))
    print("connet ")
    server_input =s.recv(1024)
    server_input.decode()
    print("Received message: " + server_input)
    s.close()
if __name__ == '__main__':
    main()
It is there any problem with my code? Thank you so much!!!
s.send(user_input.encode())
The server needs to call accept on the server socket to get a socket for the connected client, then call send on this connected socket, not on the server socket.
Without this the connect in the client will still succeed, since it is done by the OS kernel on the server side. But since the connected socket is never accepted by the server it will be reset, thus resulting in the error you see.
So a more correct code on the server side would be
s.listen(2)
c,_ = s.accept()
user_input = input("Enter a message: ")
c.send(user_input.encode())
c.close()
Note that your client code has also other problems, i.e it should be
print("Received message: " + server_input.decode())
        
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