from selenium import webdriver
import time
browser=webdriver.Chrome(executable_path='D:\workspace\chromedriver')

browser.get('https://mp.weixin.qq.com/promotion/frame?t=ad_system/common_simple_frame&t1=campaign/edit&token=1340577178&from_pos_type=0#/')
time.sleep(2)
browser.find_element_by_xpath('//*[@id="kw"]').send_keys("selenium")
time.sleep(2)
browser.find_element_by_xpath('//*[@id="su"]').click()