selenium元素定位方法

 在最新版本的selenium中，已经不支持之前的元素定位方法，如find_element_by_id、find_element_by_xpath等。需将语法更改为：driver.find_element(By.ID, "username")等。特此记录。

示例如下：

from selenium import webdriver
from selenium.webdriver.common.by import By
driver = webdriver.Chrome()
# id
driver.find_element(By.ID, "username")
# name
driver.find_element(By.NAME, "keyword")
# class name
driver.find_element(By.CLASS_NAME, "login_btn")
# tag_name
driver.find_element(By.TAG_NAME, "select")
# link_text
driver.find_element(By.LINK_TEXT, "进入商城购物")
# partial_link_text
driver.find_element(By.PARTIAL_LINK_TEXT, "人资")
# xpath
driver.find_element(By.XPATH, "/html/body/div[3]/div[2]/div[3]/div/div[1]/a/img")
# css_selector
driver.find_element(By.CSS_SELECTOR, '[value="1"]')