import selectors
import socket
import time

socks = []
sel = selectors.DefaultSelector()
for x in range(1000):
    s = socket.socket()
    sel.register(s, selectors.EVENT_WRITE | selectors.EVENT_READ, lambda: 0)
    socks.append(s)
t = time.time()
for s in socks:
    sel.modify(s.fileno(), selectors.EVENT_WRITE)
print(time.time() - t)