用bs4爬取标签内的text的问题

def get_coursename(info):
  info = get_content(url)
  soup = BeautifulSoup(info)
  
  all_coursename = soup.find_all('h2', class_="color-primary-text headline-1-text flex-1")
  
  #print all_coursename
  
  f = open("course_coursename.txt","w")
  for coursename in all_coursename:
      detail = soup.h2.get_text()
      
      print detail
      f.write(detail + '\n' )
      f.close
  return all_coursename

以上是我的代码，使用soup.find_all（）函数后在coursera得到64个标签段，但是使用递归对象和写入文件后，controlb后得到了64个第一个课程的名字，如下，求大神解答

Buddhism and Modern Psychology
Buddhism and Modern Psychology