https://www.cnblogs.com/yoyoketang/p/6123834.html
https://www.cnblogs.com/yoyoketang/p/6123890.html
# coding:utf-8
from selenium import webdriver
driver = webdriver.Firefox()
driver.get("https://www.baidu.com")
#通过id定位百度搜索框,并输入“Python”
#driver.find_element_by_id("search-key").send_keys("Python")
driver.find_element_by_class_name("engine-key").send_keys("python")
输出的结果值是空的。