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18. `bs object Node name next_ sibling` previous_ Sibling get sibling node

2022-06-29 20:12:00 【Andy Python learning notes】

18. bs object . The node name .next_sibling previous_sibling Get brother nodes

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1. bs object . The node name .next_sibling Get the next sibling node

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sibling [ˈsɪblɪŋ]： brother .

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

#  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 p—— For the first 1 individual p node ：")
print(bs_duixiang.p,'\n')

print(" step 2.1：bs object . The node name p.next_sibling—— For the first 2 individual p node ：")
print(bs_duixiang.p.next_sibling,'\n')

print(" step 2.2： The obtained data type is tag object ：")
print(type(bs_duixiang.p.next_sibling),'\n')

【 Terminal output 】

 step 1：bs object . The node name p—— For the first 1 individual p node ：
<p> Let's ask the roller shutter </p> 

 step 2.1：bs object . The node name p.next_sibling—— For the first 2 individual p node ：
<p> But the Begonia is still </p> 

 step 2.2： The obtained data type is tag object ：
<class 'bs4.element.Tag'>

2. bs object . The node name .next_siblings Get all the following sibling nodes

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

#  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 p—— For the first 1 individual p node ：")
print(bs_duixiang.p,'\n')

print(" step 2.1：bs object . The node name p.next_siblings—— For the first 1 individual p All sibling nodes behind the node ：")
print(bs_duixiang.p.next_siblings,'\n')

print(" step 2.2： The obtained data type is generator ：")
print(type(bs_duixiang.p.next_siblings),'\n')

print(" Method of value taking 1： utilize for Loop takes value from generator ,i Represents the element sequence number ,child Show elements :")
for i, child in enumerate(bs_duixiang.p.next_siblings) :
    print(i, child)

print('\n')
print(" Method of value taking 2： use list Function takes value from generator , What you get is a list :")
print(list(enumerate(bs_duixiang.p.next_siblings)))

【 Terminal output 】

 step 1：bs object . The node name p—— For the first 1 individual p node ：
<p> Let's ask the roller shutter </p> 

 step 2.1：bs object . The node name p.next_siblings—— For the first 1 individual p All sibling nodes behind the node ：
<generator object PageElement.next_siblings at 0x000001C8C4BD46D0> 

 step 2.2： The obtained data type is generator ：
<class 'generator'> 

 Method of value taking 1： utilize for Loop takes value from generator ,i Represents the element sequence number ,child Show elements :
0 <p> But the Begonia is still </p>
1 <p> To know whether ？ To know whether ？</p>
2 <p> It should be green, fat, red and thin </p>


 Method of value taking 2： use list Function takes value from generator , What you get is a list :
[(0, <p> But the Begonia is still </p>), (1, <p> To know whether ？ To know whether ？</p>), (2, <p> It should be green, fat, red and thin </p>)]

3. bs object . The node name .previous_sibling Gets the previous sibling node

previous [ˈpriːviəs]： Ahead .

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

#  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 p—— For the first 1 individual p node ：")
print(bs_duixiang.p,'\n')

print(" step 2.1：bs object . The node name .previous_siblingg—— For the first p In front of the node h3 node ：")
print(bs_duixiang.p.previous_sibling,'\n')

print(" step 2.2： The obtained data type is tag object ：")
print(type(bs_duixiang.p.previous_sibling),'\n')

【 Terminal output 】

 step 1：bs object . The node name p—— For the first 1 individual p node ：
<p> Let's ask the roller shutter </p> 

 step 2.1：bs object . The node name .previous_siblingg—— For the first p In front of the node h3 node ：
<h3> Li qingzhao <span>（ The song dynasty ）</span></h3> 

 step 2.2： The obtained data type is tag object ：
<class 'bs4.element.Tag'>

4. bs object . The node name .previous_siblings Get all the previous sibling nodes

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

#  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> """
# 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 p—— For the first 1 individual p node ：")
print(bs_duixiang.p,'\n')

print(" step 2.1：bs object . The node name p.previous_siblings—— For the first 1 individual p All sibling nodes in front of the node ：")
print(bs_duixiang.p.previous_siblings,'\n')

print(" step 2.2： The obtained data type is generator ：")
print(type(bs_duixiang.p.previous_siblings),'\n')


print(" Method of value taking 1： utilize for Loop takes value from generator ,i Represents the element sequence number ,child Show elements :")
for i,child in enumerate(bs_duixiang.p.previous_siblings) :
    print(i, child)

print('\n')
print(" Method of value taking 2： use list Function takes value from generator , What you get is a list :")
print(list(enumerate(bs_duixiang.p.previous_siblings)))

【 Terminal output 】

 step 1：bs object . The node name p—— For the first 1 individual p node ：
<p> Let's ask the roller shutter </p> 

 step 2.1：bs object . The node name p.previous_siblings—— For the first 1 individual p All sibling nodes in front of the node ：
<generator object PageElement.previous_siblings at 0x000001C8C4B05900> 

 step 2.2： The obtained data type is generator ：
<class 'generator'> 

 Method of value taking 1： utilize for Loop takes value from generator ,i Represents the element sequence number ,child Show elements :
0 <h3> Li qingzhao <span>（ The song dynasty ）</span></h3>
1 <h2> Like a dream </h2>


 Method of value taking 2： use list Function takes value from generator , What you get is a list :
[(0, <h3> Li qingzhao <span>（ The song dynasty ）</span></h3>), (1, <h2> Like a dream </h2>)]

5. summary

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