Questions regarding Python Thread Module.

I'm making a chat program with Python and I'm in trouble. You need to turn socket receive and send together with the thread, but if you turn input to the thread, other threads will also stop. If you enter input, the sending thread will turn again and stop at input.

import threading
import time

lock = threading.Lock()

def inp():
    while True:
        a = input ('input:')
        print(a)
        time.sleep(1)

def pr():
    while True:
        print('dd\n')
        time.sleep(1)

inp()
t = threading.Thread(target = pr)
t.start()

This is a code that I made to test the thread module, and here I found that input stops other threads. Please tell me I made a mistake.