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17 `bs object Node name h3 Parent ` parents get parent node ancestor node

2022-06-28 21:22:00 【Andy Python learning notes】

17 bs object . The node name h3.parent parents Get parent node Ancestral node

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1. bs object . The node name h3.parent Get parent node

parent [ˈpeərənt]： father .

Grammar format ：bs object . The node name h3.parent
Return value ： Node object

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#  Make a statement html_str String variable , Storage part HTML Code 
html_str = """ <html> <head><meta charset="utf-8"><title> Ancient poetry 2 The first </title></head> <body> <div class="poems" id="section1"><h2> Like a dream </h2><h3> Li qingzhao <span>（ The song dynasty ）</span></h3><p> Let's ask the roller shutter </p><p> But the Begonia is still </p><p> To know whether ？ To know whether ？</p><p> It should be green, fat, red and thin </p></div> <div class="poems" id="section2"><h2> Untitled </h2><h3> anonymous </h3> <p> This is blue lantern </p><p> But because of the wine left dust </p><p> Finally, Zhuang Zhou dreamed of butterfly </p><p> You are a gift and a curse </p> </div> </body> </html> """
# 1.  from bs4 Parsing library import BeautifulSoup Class is used to parse data 
from bs4 import BeautifulSoup

# 2.1 BeautifulSoup class （ The string to parse , Parser ）
# 2.2  Pass in the string to parse html_str And parsers lxml, Instantiate the class to get a BeautifulSoup object  
bs_duixiang = BeautifulSoup(html_str, 'lxml')

print(" step 1：bs object . The node name h3—— Take it to 1 individual h3 node ：")
print(bs_duixiang.h3,'\n')

print(" step 2.1：bs object . The node name h3.parent—— Take it to h3 Parent of node div node ：")
print(bs_duixiang.h3.parent,'\n')

print(" step 2.2  View the data type of the node ：")
print(type(bs_duixiang.h3.parent),'\n')

【 Terminal output 】

 step 1：bs object . The node name h3—— Take it to 1 individual h3 node ：
<h3> Li qingzhao <span>（ The song dynasty ）</span></h3> 

 step 2.1：bs object . The node name h3.parent—— Take it to h3 Parent of node div node ：
<div class="poems" id="section1"><h2> Like a dream </h2><h3> Li qingzhao <span>（ The song dynasty ）</span></h3><p> Let's ask the roller shutter </p><p> But the Begonia is still </p><p> To know whether ？ To know whether ？</p><p> It should be green, fat, red and thin </p></div> 

 step 2.2  View the data type of the node ：
<class 'bs4.element.Tag'>

2. bs object . The node name h3.parents Get ancestor nodes

enumerate [ɪˈnjuːməreɪt]: list , stay Python Add enumerate The element index can be output .

Grammar format ：bs object . The node name .parents
Return value ： generator
Method of value taking ：
Method 1：for Loop takes value from generator for i,child in enumerate(bs_duixiang.h3.parents)
Method 2： use list Function takes value from generator list(enumerate(bs_duixiang.h3.parents))

2.1 for Loop takes value from generator 

#  Make a statement html_str String variable , Storage part HTML Code 
html_str = """ <html> <head><meta charset="utf-8"><title> Ancient poetry 2 The first </title></head> <body> <div class="poems" id="section1"><h2> Like a dream </h2><h3> Li qingzhao <span>（ The song dynasty ）</span></h3><p> Let's ask the roller shutter </p><p> But the Begonia is still </p><p> To know whether ？ To know whether ？</p><p> It should be green, fat, red and thin </p></div> <div class="poems" id="section2"><h2> Untitled </h2><h3> anonymous </h3> <p> This is blue lantern </p><p> But because of the wine left dust </p><p> Finally, Zhuang Zhou dreamed of butterfly </p><p> You are a gift and a curse </p> </div> </body> </html> """
# 1.  from bs4 Parsing library import BeautifulSoup Class is used to parse data 
from bs4 import BeautifulSoup

# 2.1 BeautifulSoup class （ The string to parse , Parser ）
# 2.2  Pass in the string to parse html_str And parsers lxml, Instantiate the class to get a BeautifulSoup object  
bs_duixiang = BeautifulSoup(html_str, 'lxml')

print(" step 1：bs object . The node name h3—— Take it to 1 individual h3 node ：")
print(bs_duixiang.h3,'\n')

print(" step 2.1：bs object . The node name h3.parents—— Take it to h3 The ancestor node of the node ：")
print(bs_duixiang.h3.parents,'\n')

print(" step 2.2  View the data type of the node ：")
print(type(bs_duixiang.h3.parents),'\n')

print(" step 3：for Loop takes value from generator :")
for i,child in enumerate(bs_duixiang.h3.parents) :
    print(i, child)

【 Terminal output 】

 step 1：bs object . The node name h3—— Take it to 1 individual h3 node ：
<h3> Li qingzhao <span>（ The song dynasty ）</span></h3> 

 step 2.1：bs object . The node name h3.parents—— Take it to h3 The ancestor node of the node ：
<generator object PageElement.parents at 0x0000017B0D5144A0> 

 step 2.2  View the data type of the node ：
<class 'generator'> 

 step 3：for Loop takes value from generator :
0 <div class="poems" id="section1"><h2> Like a dream </h2><h3> Li qingzhao <span>（ The song dynasty ）</span></h3><p> Let's ask the roller shutter </p><p> But the Begonia is still </p><p> To know whether ？ To know whether ？</p><p> It should be green, fat, red and thin </p></div>
1 <body>
<div class="poems" id="section1"><h2> Like a dream </h2><h3> Li qingzhao <span>（ The song dynasty ）</span></h3><p> Let's ask the roller shutter </p><p> But the Begonia is still </p><p> To know whether ？ To know whether ？</p><p> It should be green, fat, red and thin </p></div>
<div class="poems" id="section2"><h2> Untitled </h2><h3> anonymous </h3>
<p> This is blue lantern </p><p> But because of the wine left dust </p><p> Finally, Zhuang Zhou dreamed of butterfly </p><p> You are a gift and a curse </p>
</div>
</body>
2 <html>
<head><meta charset="utf-8"/><title> Ancient poetry 2 The first </title></head>
<body>
<div class="poems" id="section1"><h2> Like a dream </h2><h3> Li qingzhao <span>（ The song dynasty ）</span></h3><p> Let's ask the roller shutter </p><p> But the Begonia is still </p><p> To know whether ？ To know whether ？</p><p> It should be green, fat, red and thin </p></div>
<div class="poems" id="section2"><h2> Untitled </h2><h3> anonymous </h3>
<p> This is blue lantern </p><p> But because of the wine left dust </p><p> Finally, Zhuang Zhou dreamed of butterfly </p><p> You are a gift and a curse </p>
</div>
</body>
</html>
3 <html>
<head><meta charset="utf-8"/><title> Ancient poetry 2 The first </title></head>
<body>
<div class="poems" id="section1"><h2> Like a dream </h2><h3> Li qingzhao <span>（ The song dynasty ）</span></h3><p> Let's ask the roller shutter </p><p> But the Begonia is still </p><p> To know whether ？ To know whether ？</p><p> It should be green, fat, red and thin </p></div>
<div class="poems" id="section2"><h2> Untitled </h2><h3> anonymous </h3>
<p> This is blue lantern </p><p> But because of the wine left dust </p><p> Finally, Zhuang Zhou dreamed of butterfly </p><p> You are a gift and a curse </p>
</div>
</body>
</html>

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2.2 use list Function takes value from generator 

#  Make a statement html_str String variable , Storage part HTML Code 
html_str = """ <html> <head><meta charset="utf-8"><title> Ancient poetry 2 The first </title></head> <body> <div class="poems" id="section1"><h2> Like a dream </h2><h3> Li qingzhao <span>（ The song dynasty ）</span></h3><p> Let's ask the roller shutter </p><p> But the Begonia is still </p><p> To know whether ？ To know whether ？</p><p> It should be green, fat, red and thin </p></div> <div class="poems" id="section2"><h2> Untitled </h2><h3> anonymous </h3> <p> This is blue lantern </p><p> But because of the wine left dust </p><p> Finally, Zhuang Zhou dreamed of butterfly </p><p> You are a gift and a curse </p> </div> </body> </html> """
# 1.  from bs4 Parsing library import BeautifulSoup Class is used to parse data 
from bs4 import BeautifulSoup

# 2.1 BeautifulSoup class （ The string to parse , Parser ）
# 2.2  Pass in the string to parse html_str And parsers lxml, Instantiate the class to get a BeautifulSoup object  
bs_duixiang = BeautifulSoup(html_str, 'lxml')

print(" step 1：bs object . The node name h3—— Take it to 1 individual h3 node ：")
print(bs_duixiang.h3,'\n')

print(" step 2.1：bs object . The node name h3.parents—— Take it to h3 The ancestor node of the node ：")
print(bs_duixiang.h3.parents,'\n')

print(" step 2.2  View the data type of the node ：")
print(type(bs_duixiang.h3.parents),'\n')

print(" step 3： use list Function takes value from generator :")
print(list(enumerate(bs_duixiang.h3.parents)))

【 Terminal output 】

 step 1：bs object . The node name h3—— Take it to 1 individual h3 node ：
<h3> Li qingzhao <span>（ The song dynasty ）</span></h3> 

 step 2.1：bs object . The node name h3.parents—— Take it to h3 The ancestor node of the node ：
<generator object PageElement.parents at 0x0000017B0D514580> 

 step 2.2  View the data type of the node ：
<class 'generator'> 

 step 3： use list Function takes value from generator :
[(0, <div class="poems" id="section1"><h2> Like a dream </h2><h3> Li qingzhao <span>（ The song dynasty ）</span></h3><p> Let's ask the roller shutter </p><p> But the Begonia is still </p><p> To know whether ？ To know whether ？</p><p> It should be green, fat, red and thin </p></div>), (1, <body>
<div class="poems" id="section1"><h2> Like a dream </h2><h3> Li qingzhao <span>（ The song dynasty ）</span></h3><p> Let's ask the roller shutter </p><p> But the Begonia is still </p><p> To know whether ？ To know whether ？</p><p> It should be green, fat, red and thin </p></div>
<div class="poems" id="section2"><h2> Untitled </h2><h3> anonymous </h3>
<p> This is blue lantern </p><p> But because of the wine left dust </p><p> Finally, Zhuang Zhou dreamed of butterfly </p><p> You are a gift and a curse </p>
</div>
</body>), (2, <html>
<head><meta charset="utf-8"/><title> Ancient poetry 2 The first </title></head>
<body>
<div class="poems" id="section1"><h2> Like a dream </h2><h3> Li qingzhao <span>（ The song dynasty ）</span></h3><p> Let's ask the roller shutter </p><p> But the Begonia is still </p><p> To know whether ？ To know whether ？</p><p> It should be green, fat, red and thin </p></div>
<div class="poems" id="section2"><h2> Untitled </h2><h3> anonymous </h3>
<p> This is blue lantern </p><p> But because of the wine left dust </p><p> Finally, Zhuang Zhou dreamed of butterfly </p><p> You are a gift and a curse </p>
</div>
</body>
</html>), (3, <html>
<head><meta charset="utf-8"/><title> Ancient poetry 2 The first </title></head>
<body>
<div class="poems" id="section1"><h2> Like a dream </h2><h3> Li qingzhao <span>（ The song dynasty ）</span></h3><p> Let's ask the roller shutter </p><p> But the Begonia is still </p><p> To know whether ？ To know whether ？</p><p> It should be green, fat, red and thin </p></div>
<div class="poems" id="section2"><h2> Untitled </h2><h3> anonymous </h3>
<p> This is blue lantern </p><p> But because of the wine left dust </p><p> Finally, Zhuang Zhou dreamed of butterfly </p><p> You are a gift and a curse </p>
</div>
</body>
</html>
)]

After running the code , Get a list .
The top number of the list 0,1,2,3 Is the index of the element .
The first 1 The element is h3 Parent of node div node .
The first 2 The element is div The parent of the node body node .
The first 3 The element is body Parent of node html node .
The first 4 Elements are all nodes .

for Circulation and list The final output of the function is the same , It's just list The output of the function is in the form of a list .

3. summary

Insert picture description here

4. attach html Code 

<html>                                         <!--html Node is body Parent of node , yes h3 The ancestor node of the node -->
    <head>                                     <!--head Nodes and div Node level , No h3 The ancestor node of the node -->
        <meta charset="utf-8">
        <title> Ancient poetry 2 The first </title>
    </head>
    <body>                                     <!--body Node is div Parent of node , yes h3 The ancestor node of the node -->
        <div class="poems" id="section1">      <!--div Node is h3 Parent of node -->
            <h2> Like a dream </h2>
            <h3> Li qingzhao <span>（ The song dynasty ）</span></h3>  <!-- With h3 Node as the benchmark -->
            <p> Let's ask the roller shutter </p>
            <p> But the Begonia is still </p>
            <p> To know whether ？ To know whether ？</p>
            <p> It should be green, fat, red and thin </p>
        </div>

        <div class="poems" id="section2">
            <h2> Untitled </h2>
            <h3> anonymous </h3>
            <p> This is blue lantern </p>
            <p> But because of the wine left dust </p>
            <p> Finally, Zhuang Zhou dreamed of butterfly </p>
            <p> You are a gift and a curse </p>
        </div>
    </body>
</html>
Sample web page

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本文为[Andy Python learning notes]所创，转载请带上原文链接，感谢
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