您要查找的项目位于iframe中。您需要先将Webdriver的上下文切换到框架。
from selenium import webdriver
import os
from selenium.webdriver import chrome
driver = webdriver.Chrome()
driver.get("http://nmcunited.me.showenter.com/%D7%9C%D7%94-%D7%9C%D7%94-%D7%9C%D7%A0%D7%93.html")
driver.implicitly_wait(15)
frame = driver.find_element_by_css_selector('div.tool_forms iframe')
driver.switch_to.frame(frame)
christmasTag = driver.find_element_by_id('f_2561406_1')
christmasTag.click()
driver.close()