threads.py

gistfile1.txt

#!/usr/bin/env python3

import threading
seen = {}

def get_client():
    key = id(threading.current_thread())
    if seen.get(key):
        print(f'reusing id {key}')
        pass
    else:
        print(f'new id #{key}')
        seen[key] = 1

for i in range(0,1000):
  th = threading.Thread(target=get_client)
  th.start()
  th.join()

python3 thread-ids.py|grep -c reusing
991
python3 thread-ids.py|grep -c new
9