警告

DeprecationWarning: find_element_by_* commands are deprecated. Please use find_element() instead
  button=broser.find_element_by_xpath('//span')

find_element_by_*已被废弃

原来写法

button=broser.find_element_by_xpath('//span')

现在写法

button=broser.find_element(By.XPATH,'//span')

要事先导入就不会报错了

from selenium.webdriver.common.by import By