day_03 2

基本使用
html_doc = """
<html><head><title>The Dormouse's story</title></head>
<body>
<p class="sister"><b>$37</b></p>

<p class="story" id="p">Once upon a time there were three little sisters; and their names were
<a href="http://example.com/elsie" class="sister" >Elsie</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.</p>

<p class="story">...</p>
"""

find: a first look

find_ all: to find all

Find and Find tag attributes:

The name attribute matching
name tag name
attrs attribute to find a match

Contextual text
labels:
- global matching filter string String

- Regular filter
re matching module

- List Filter

Data matching in the list

-bool filter
True Match

- method filter
for some of the attributes you want and do not need to look for the property.

Properties:
- class_

- id

html_doc = """
<html><head><title>The Dormouse's story</title></head><body><p class="sister"><b>$37</b></p><p class="story" id="p">Once upon a time there were three little sisters; and their names were<a href="http://example.com/elsie" class="sister" >Elsie</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.</p><p class="story">...</p>
"""

P'= soup.find (name =
P' ''
String filter'' ')
'lxml'= the BeautifulSoup (html_doc,
Soupthe BeautifulSoupImportBS4from
')
p_s=soup.find_all(name='p')
print(p)
print(p_s)
p=soup.find(name='p',attrs={"id":"p"})
print(p)

tag=soup.find(name='a',attrs={"class":"sister"},text="Elsie")
print(tag)

'''
re matching module
Regular filter
'''
import re
a=soup.find(name=re.compile('a'))
print(a)
a_s=soup.find_all(name=re.compile('a'))
print(a_s)

a=soup.find(attrs={"id":re.compile('link')})
print(a)

print(soup.find(name=['a','p''html',re.compile('a')]))
print(soup.find_all(name=['a','p','html',re.compile('a')]))

print(soup.find(name=True,attrs={"id":True}))
def have_id_not_class(tag):
    if tag.name=='p' and tag.has_attr("id") and not tag.has_attr("class"):
        return tag
print(soup.find_all(name=have_id_not_class))
a=soup.find(id='link2')
print(a)
p=soup.find(class_='sister')
print(p)

html_doc = """
<html><head><title>The Dormouse's story</title></head><body><p class="sister"><b>$37</b></p><p class="story" id="p">Once upon a time there were three little sisters; and their names were<a href="http://example.com/elsie" class="sister" >Elsie</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.</p><p class="story">...</p>
"""
P_s soup.find_all = ()'P'=nameP = soup.find (' ''String filter'' ')'lxml'Soup = the BeautifulSoup (html_doc,the BeautifulSoupImportBS4from






name = 'P' ) 
Print (P) 
Print (P_s) 
P = soup.find ( name = 'P' , attrs = { "ID" : "P" }) 
Print (P) 

Tag = soup.find ( name = 'A' , attrs = { "class" : "SISTER" }, text = "Elsie" ) 
Print (Tag) 

'' ' 
regular filter 
re matching module 
' '' 
Import re 
A = soup.find ( name = re.compile('a'))
print(a)
a_s=soup.find_all(name=re.compile('a'))
print(a_s)

a=soup.find(attrs={"id":re.compile('link')})
print(a)

print(soup.find(name=['a','p''html',re.compile('a')]))
print(soup.find_all(name=['a','p','html',re.compile('a')]))

print(soup.find(name=True,attrs={"id":True}))
def have_id_not_class(tag):
    if tag.name=='p' and tag.has_attr("id") and not tag.has_attr("class"):
        return tag
print(soup.find_all(name=have_id_not_class))
a=soup.find(id='link2')
print(a)
p=soup.find(class_='sister')
print(p)

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