This should just work.
Can you show what code you're doing?
For example, given the following echo-server written in Racket,
;;;;;;;;;;;;;;;;;;;;
#lang racket
(define listener (tcp-listen 12345))
(let echo-server ()
(define-values (in out) (tcp-accept listener))
(thread (λ () (copy-port in out) (close-output-port out)))
(echo-server))
;;;;;;;;;;;;;;;;;;;;
then the following interaction in Python shows that this is doing something:
###########################################
>>> import socket
>>> s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
>>> s.connect(('localhost', 12345))
>>> s.send("hello")
5
>>> s.recv(500)
'hello'
###########################################
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