You can use the socket library in Python to listen for incoming connections. For example:

```python
import socket

HOST = "localhost"  # Address to listen on, can be an IP
PORT = 20000  # Port to listen on (non-privileged ports are > 1023)

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.bind((HOST, PORT))
    s.listen()
    conn, addr = s.accept()
    with conn:
        print(f"Accepted incoming connection from {addr}")
        while True:
            data = conn.recv(1024)
            if not data:
                break
            conn.sendall(data)
```
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