标签：html pytho soup mit a标签 html_ desc rip tle
BeautifulSoup是一个模块，该模块用于接收一个HTML或XML字符串，然后将其进行格式化，之后遍可以使用他提供的方法进行快速查找指定元素，从而使得在HTML或XML中查找指定元素变得简单。
from bs4 import BeautifulSoup
html_doc = """<html><head><title>The Dormouse‘s story</title></head><body>asdf <div class="title"> <b>The Dormouse‘s story总共</b> <h1>f</h1> </div><div class="story">Once upon a time there were three little sisters; and their names were <a class="sister0" id="link1">Els<span>f</span>ie</a>, <a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and <a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>;and they lived at the bottom of a well.</div>ad<br/>sf<p class="story">...</p></body></html>"""soup = BeautifulSoup(html_doc, features="lxml")# 找到第一个a标签tag1 = soup.find(name=‘a‘)# 找到所有的a标签tag2 = soup.find_all(name=‘a‘)# 找到id＝link2的标签tag3 = soup.select(‘#link2‘)from bs4 import BeautifulSoup
html_doc = """<html><head><title>The Dormouse‘s story</title></head><body> ...</body></html>"""soup = BeautifulSoup(html_doc, features="lxml")# tag = soup.find(‘a‘)
# name = tag.name # 获取# print(name)# tag.name = ‘span‘ # 设置# print(soup)# tag = soup.find(‘a‘)
# attrs = tag.attrs # 获取# print(attrs)# tag.attrs = {‘ik‘:123} # 设置# tag.attrs[‘id‘] = ‘iiiii‘ # 设置# print(soup)# body = soup.find(‘body‘)
# v = body.children# body = soup.find(‘body‘)
# v = body.descendants# tag = soup.find(‘body‘)
# tag.clear()# print(soup)# body = soup.find(‘body‘)
# body.decompose()# print(soup)7. extract,递归的删除所有的标签，并获取删除的标签
# body = soup.find(‘body‘)
# v = body.extract()# print(soup)8. decode,转换为字符串（含当前标签）；decode_contents（不含当前标签）
# body = soup.find(‘body‘)
# v = body.decode()# v = body.decode_contents()# print(v)9. encode,转换为字节（含当前标签）；encode_contents（不含当前标签）
# body = soup.find(‘body‘)
# v = body.encode()# v = body.encode_contents()# print(v)10. find,获取匹配的第一个标签
# tag = soup.find(‘a‘)
# print(tag)
# tag = soup.find(name=‘a‘, attrs={‘class‘: ‘sister‘}, recursive=True, text=‘Lacie‘)
# tag = soup.find(name=‘a‘, class_=‘sister‘, recursive=True, text=‘Lacie‘)
# print(tag)
# tags = soup.find_all(‘a‘)
# print(tags)
# tags = soup.find_all(‘a‘,limit=1)
# print(tags)
# tags = soup.find_all(name=‘a‘, attrs={‘class‘: ‘sister‘}, recursive=True, text=‘Lacie‘)
# # tags = soup.find(name=‘a‘, class_=‘sister‘, recursive=True, text=‘Lacie‘)
# print(tags)
# ####### 列表 #######
# v = soup.find_all(name=[‘a‘,‘div‘])
# print(v)
# v = soup.find_all(class_=[‘sister0‘, ‘sister‘])
# print(v)
# v = soup.find_all(text=[‘Tillie‘])
# print(v, type(v[0]))
# v = soup.find_all(id=[‘link1‘,‘link2‘])
# print(v)
# v = soup.find_all(href=[‘link1‘,‘link2‘])
# print(v)
# ####### 正则 #######
import re
# rep = re.compile(‘p‘)
# rep = re.compile(‘^p‘)
# v = soup.find_all(name=rep)
# print(v)
# rep = re.compile(‘sister.*‘)
# v = soup.find_all(class_=rep)
# print(v)
# rep = re.compile(‘http://www.oldboy.com/static/.*‘)
# v = soup.find_all(href=rep)
# print(v)
# ####### 方法筛选 #######
# def func(tag):
# return tag.has_attr(‘class‘) and tag.has_attr(‘id‘)
# v = soup.find_all(name=func)
# print(v)
# ## get,获取标签属性
# tag = soup.find(‘a‘)
# v = tag.get(‘id‘)
# print(v)
12. has_attr,检查标签是否具有该属性
# tag = soup.find(‘a‘)
# v = tag.has_attr(‘id‘)# print(v)# tag = soup.find(‘a‘)
# v = tag.get_text(‘id‘)# print(v)# tag = soup.find(‘body‘)
# v = tag.index(tag.find(‘div‘))# print(v)# tag = soup.find(‘body‘)# for i,v in enumerate(tag):# print(i,v)
15. is_empty_element,是否是空标签(是否可以是空)或者自闭合标签，
判断是否是如下标签：‘br‘ , ‘hr‘, ‘input‘, ‘img‘, ‘meta‘,‘spacer‘, ‘link‘, ‘frame‘, ‘base‘
# tag = soup.find(‘br‘)
# v = tag.is_empty_element# print(v)16. 当前的关联标签
# soup.next# soup.next_element# soup.next_elements# soup.next_sibling# soup.next_siblings## tag.previous# tag.previous_element# tag.previous_elements# tag.previous_sibling# tag.previous_siblings## tag.parent# tag.parents
17. 查找某标签的关联标签
# tag.find_next(...)# tag.find_all_next(...)# tag.find_next_sibling(...)# tag.find_next_siblings(...)# tag.find_previous(...)# tag.find_all_previous(...)# tag.find_previous_sibling(...)# tag.find_previous_siblings(...)# tag.find_parent(...)# tag.find_parents(...)# 参数同find_all18. select,select_one, CSS选择器
soup.select("title")soup.select("p nth-of-type(3)")soup.select("body a")soup.select("html head title")tag = soup.select("span,a")soup.select("head > title")soup.select("p > a")soup.select("p > a:nth-of-type(2)")soup.select("p > #link1")soup.select("body > a")soup.select("#link1 ~ .sister")soup.select("#link1 + .sister")soup.select(".sister")soup.select("[class~=sister]")soup.select("#link1")soup.select("a#link2")soup.select(‘a[href]‘)soup.select(‘a[href="http://example.com/elsie"]‘)soup.select(‘a[href^="http://example.com/"]‘)soup.select(‘a[href$="tillie"]‘)soup.select(‘a[href*=".com/el"]‘)from bs4.element import Tagdef default_candidate_generator(tag): for child in tag.descendants: if not isinstance(child, Tag): continue if not child.has_attr(‘href‘): continue yield childtags = soup.find(‘body‘).select("a", _candidate_generator=default_candidate_generator)print(type(tags), tags)from bs4.element import Tagdef default_candidate_generator(tag): for child in tag.descendants: if not isinstance(child, Tag): continue if not child.has_attr(‘href‘): continue yield childtags = soup.find(‘body‘).select("a", _candidate_generator=default_candidate_generator, limit=1)print(type(tags), tags)19. 标签的内容
# tag = soup.find(‘span‘)# print(tag.string) # 获取# tag.string = ‘new content‘ # 设置# print(soup)# tag = soup.find(‘body‘)# print(tag.string)# tag.string = ‘xxx‘# print(soup)# tag = soup.find(‘body‘)# v = tag.stripped_strings # 递归内部获取所有标签的文本# print(v)20.append在当前标签内部追加一个标签
# tag = soup.find(‘body‘)# tag.append(soup.find(‘a‘))# print(soup)## from bs4.element import Tag# obj = Tag(name=‘i‘,attrs={‘id‘: ‘it‘})# obj.string = ‘我是一个新来的‘# tag = soup.find(‘body‘)# tag.append(obj)# print(soup)21.insert在当前标签内部指定位置插入一个标签
# from bs4.element import Tag# obj = Tag(name=‘i‘, attrs={‘id‘: ‘it‘})# obj.string = ‘我是一个新来的‘# tag = soup.find(‘body‘)# tag.insert(2, obj)# print(soup)22. insert_after,insert_before 在当前标签后面或前面插入
# from bs4.element import Tag# obj = Tag(name=‘i‘, attrs={‘id‘: ‘it‘})# obj.string = ‘我是一个新来的‘# tag = soup.find(‘body‘)# # tag.insert_before(obj)# tag.insert_after(obj)# print(soup)# from bs4.element import Tag# obj = Tag(name=‘i‘, attrs={‘id‘: ‘it‘})# obj.string = ‘我是一个新来的‘# tag = soup.find(‘div‘)# tag.replace_with(obj)# print(soup)24. 创建标签之间的关系
# tag = soup.find(‘div‘)# a = soup.find(‘a‘)# tag.setup(previous_sibling=a)# print(tag.previous_sibling)25. wrap，将指定标签把当前标签包裹起来
# from bs4.element import Tag# obj1 = Tag(name=‘div‘, attrs={‘id‘: ‘it‘})# obj1.string = ‘我是一个新来的‘## tag = soup.find(‘a‘)# v = tag.wrap(obj1)# print(soup)# tag = soup.find(‘a‘)# v = tag.wrap(soup.find(‘p‘))# print(soup)26. unwrap，去掉当前标签，将保留其包裹的标签
# tag = soup.find(‘a‘)# v = tag.unwrap()# print(soup)
标签：html pytho soup mit a标签 html_ desc rip tle
原文地址：http://www.cnblogs.com/jcwit/p/7784357.html
