from selenium import webdriver
import random
driver = webdriver.Chrome()
driver.get("http://www.example.com")
select_element = driver.find_element_by_id("month")
options = select_element.find_elements_by_tag_name("option")
options.pop(0)
random_index = random.randint(0, len(options)-1)
options[random_index].click()
driver.quit()