purple-electrumwallet/scripts/block_headers

#!/usr/bin/env python

# A simple script that connects to a server and displays block headers

import time, electrum

# start network
network = electrum.NetworkProxy(False)
network.start()

# wait until connected
while network.is_connecting():
    time.sleep(0.1)

if not network.is_connected():
    print_msg("daemon is not connected")
    sys.exit(1)

# 2. send the subscription
callback = lambda result: electrum.print_json(result.get('result'))
network.send([('blockchain.headers.subscribe',[])], callback)

# 3. wait for results
while network.is_connected():
    try:
        time.sleep(1)
    except:
        break

network.stop()