获取<p>元素的所有直接子元素节点from bs4 import BeautifulSoupdoc='''<html><head><title>The Dormouse's story</title></head><body><p class="title"><b>The <i>Dormouse's</i> story</b> Once upon a time ...</p></body></html>'''soup=BeautifulSoup(doc,"lxml")________________for x in __________________: print(x)缺失的语句是: