Two step login-in in Telegram using https://github.com/LonamiWebs/Telethon

two_step_login.py

from telethon import TelegramClient

api_id = 12345
api_hash = '0123456789abcdef0123456789abcdef'
phone = '+34600000000'

# First Connect
client = TelegramClient('user_{}'.format(phone[1:]), api_id, api_hash)
client.connect()

if not client.is_user_authorized():
    sended = client.send_code_request(phone)
    stored_code_hash = sended.phone_code_hash
    client.disconnect()
    # ...
    # Requesting code input at new page/instance/step

    ################################

    # Second Connect
    client2 = TelegramClient('user_{}'.format(phone[1:]), api_id, api_hash)

    client2._phone_code_hash = stored_code_hash  # Applying previous code_hash
    client2._phone = phone  # And Phone

    client2.connect()
    client2.sign_in(phone, input('CODE: '))

    print(client2.get_me())
else:
    # Do anything, u'r already logged in
    pass