交管系统，接口，UI新增删除课程

from selenium import webdriver
import time
import string, random
import requests
import pprint

sele删除课程

def Delete_Course():
	driver = webdriver.Chrome()
	driver.implicitly_wait(10)
	driver.get('http://localhost/mgr/login/login.html')
	driver.find_element_by_id('username').send_keys('auto')
	driver.find_element_by_id('password').send_keys('sdfsdfsdf')
	driver.find_element_by_tag_name('button').click()
	tbody = driver.find_elements_by_css_selector("tbody")
	if tbody:               #判断里面有没有课程，没有的话，直接退出
		tr = driver.find_elements_by_css_selector("tbody>tr")
		for i in range(1,len(tr)+1):
			driver.find_element_by_css_selector("tbody>tr>td:nth-child(4)>button:nth-child(2)").click()
			driver.find_element_by_css_selector(".btn-primary").click()
			time.sleep(0.5)
			driver.refresh()
	driver.quit()