html = """
The Dormouse's story
Once upon a time there were three little sisters; and their names were
       Lacie andTillieand they lived at the bottom of a well.
...
"""soup=BS(html,'html.parser')for i in soup.find_all('a'):    print('i.text:',i.text)#注释掉的内容就不打印了  str类型    print('i.string:',i.string)  #注释掉的内容 都会打印出来，NavigableString对象print('soup.head.contents:',soup.head.contents,type(soup.head.contents))print('soup.head.children:',soup.head.children,type(soup.head.children))print('soup.body.contents:',soup.body.contents)#返回一个子元素的列表print('soup.body.children:',soup.body.children)#返回一个子元素的迭代器for i in soup.body.children:    print(i)print('子孙节点 都显示出来')for i in soup.body.descendants:    print(i)print('soup.body.string:',soup.body.string)print('soup.body.strings:',soup.body.strings)print('soup.body.stripped_strings:',soup.body.stripped_strings)  #过滤掉所有空格显示print('去掉空格的body子元素：')for i  in soup.body.stripped_strings:    print(i)print('soup.a.parent:',soup.a.parent)print('soup.a.next_sibling:',soup.a.next_sibling)  #注意文本节点、换行\n都可能成为当前节点的上一个或者下一个同级节点print('soup.a.previous_sibling:',soup.a.previous_sibling)print('soup.a.next_element:',soup.a.next_element)  #下一个元素 不一定同级print('soup.a.previous_element:',soup.a.previous_element)print('打印所有后面的同级节点:\n')for i in soup.a.next_siblings:    print(i)print('soup.a.next_element:',list(soup.a.next_elements)[1])print('***********find_all*****')print(soup.find_all('a'))print('引入正则表达式：')import reprint(soup.find_all(re.compile(r'^title')))  #正则匹配的是 标签的名字print('列表的方式匹配：')print(soup.find_all(['a','b']))print('函数的方式匹配，类似filter')def func(tag):    if tag.has_attr('class') and re.search(r'^a',tag.name):        return tagprint(soup.find_all(func))html = """
The Dormouse's story
Once upon a time there were three little sisters; and their names were
       Lacie andTillieand they lived at the bottom of a well.
...
"""soup=BS(html,'html.parser')print('按属性值查找:')print(soup.find_all(id='link1'))print(soup.find_all('a',id='link1'))print(soup.find_all(id='link2',href=re.compile(r'laci')))  #返回的都是列表print(soup.find_all(class_='story')) #注意后面加的下划线print(soup.find_all(attrs={
   'class':'sister'}))print('按元素内容查找text参数：')print(soup.find_all(text='Tillie'))print(soup.find_all(text=['Tillie','Lacie']))  #返回的都是元素内容print(soup.find_all(text=re.compile(r'ormous')))print('通过内容元素 找到上级元素')print(soup.find_all(text=re.compile(r'ormous'))[1].parent.parent)#限制查找数量print('limit:')print(soup.find_all('a',limit=2))print('只在子节点查找：')print(soup.body.find_all('a',limit=2,recursive=False))  #只查找子节点 recursive循环的、递归的print(soup.body.find_all(class_='story',recursive=False))