文章詳情頁

python beautiful soup庫入門安裝教程

瀏覽：3日期：2022-08-06 18:29:08

目錄beautiful soup庫的安裝beautiful soup庫的理解beautiful soup庫的引用BeautifulSoup類回顧demo.htmlTag標簽Tag的nameTag的attrs（屬性）Tag的NavigableStringHTML基本格式標簽樹的下行遍歷標簽樹的上行遍歷標簽的平行遍歷bs庫的prettify()方法bs4庫的編碼beautiful soup庫的安裝

pip install beautifulsoup4beautiful soup庫的理解

beautiful soup庫是解析、遍歷、維護“標簽樹”的功能庫

beautiful soup庫的引用

from bs4 import BeautifulSoupimport bs4BeautifulSoup類

BeautifulSoup對應一個HTML/XML文檔的全部內容

回顧demo.html

import requestsr = requests.get('http://python123.io/ws/demo.html')demo = r.textprint(demo)

<html><head><title>This is a python demo page</title></head><body>The demo python introduces several python courses.Python is a wonderful general-purpose programming language. You can learn Python from novice to professional by tracking the following courses:<a id='link1'>Basic Python</a> and <a id='link2'>Advanced Python</a>.</body></html>Tag標簽

基本元素說明 Tag 標簽，最基本的信息組織單元，分別用<>和</>標明開頭和結尾

import requestsfrom bs4 import BeautifulSoupr = requests.get('http://python123.io/ws/demo.html')demo = r.textsoup = BeautifulSoup(demo,'html.parser')print(soup.title)tag = soup.aprint(tag)

<title>This is a python demo page</title><a >Basic Python</a>

任何存在于HTML語法中的標簽都可以用soup.訪問獲得。當HTML文檔中存在多個相同對應內容時，soup.返回第一個

Tag的name

基本元素說明 Name 標簽的名字，

…

的名字是’p’,格式：.name

import requestsfrom bs4 import BeautifulSoupr = requests.get('http://python123.io/ws/demo.html')demo = r.textsoup = BeautifulSoup(demo,'html.parser')print(soup.a.name)print(soup.a.parent.name)print(soup.a.parent.parent.name)

ap bodyTag的attrs（屬性）

基本元素說明 Attributes 標簽的屬性，字典形式組織，格式：.attrs

import requestsfrom bs4 import BeautifulSoupr = requests.get('http://python123.io/ws/demo.html')demo = r.textsoup = BeautifulSoup(demo,'html.parser')tag = soup.aprint(tag.attrs)print(tag.attrs[’class’])print(tag.attrs[’href’])print(type(tag.attrs))print(type(tag))

{’href’: ’http://www.icourse163.org/course/BIT-268001’, ’class’: [’py1’], ’id’: ’link1’}[’py1’]http://www.icourse163.org/course/BIT-268001<class ’dict’><class ’bs4.element.Tag’>Tag的NavigableString

Tag的NavigableString

基本元素說明 NavigableString 標簽內非屬性字符串，<>…</>中字符串，格式：.string

Tag的Comment

基本元素說明 Comment 標簽內字符串的注釋部分，一種特殊的Comment類型

import requestsfrom bs4 import BeautifulSoupnewsoup = BeautifulSoup('This is not a comment','html.parser')print(newsoup.b.string)print(type(newsoup.b.string))print(newsoup.p.string)print(type(newsoup.p.string))

This is a comment<class ’bs4.element.Comment’>This is not a comment<class ’bs4.element.NavigableString’>HTML基本格式標簽樹的下行遍歷

屬性說明 .contents 子節點的列表，將所有兒子結點存入列表 .children 子節點的迭代類型，與.contents類似，用于循環遍歷兒子結點 .descendents 子孫節點的迭代類型，包含所有子孫節點，用于循環遍歷

BeautifulSoup類型是標簽樹的根節點

import requestsfrom bs4 import BeautifulSoupr = requests.get('http://python123.io/ws/demo.html')demo = r.textsoup = BeautifulSoup(demo,'html.parser')print(soup.head)print(soup.head.contents)print(soup.body.contents)print(len(soup.body.contents))print(soup.body.contents[1])

<head><title>This is a python demo page</title></head>[<title>This is a python demo page</title>][’n’, The demo python introduces several python courses., ’n’, Python is a wonderful general-purpose programming language. You can learn Python from novice to professional by tracking the following courses:<a >Basic Python</a> and <a >Advanced Python</a>., ’n’]5The demo python introduces several python courses.

for child in soup.body.children:print(child) #遍歷兒子結點for child in soup.body.descendants:print(child) #遍歷子孫節點標簽樹的上行遍歷

屬性說明 .parent 節點的父親標簽 .parents 節點先輩標簽的迭代類型，用于循環遍歷先輩節點

import requestsfrom bs4 import BeautifulSoupr = requests.get('http://python123.io/ws/demo.html')demo = r.textsoup = BeautifulSoup(demo,'html.parser')print(soup.title.parent)print(soup.html.parent)

<head><title>This is a python demo page</title></head><html><head><title>This is a python demo page</title></head><body>The demo python introduces several python courses.Python is a wonderful general-purpose programming language. You can learn Python from novice to professional by tracking the following courses:<a >Basic Python</a> and <a >Advanced Python</a>.</body></html>

import requestsfrom bs4 import BeautifulSoupr = requests.get('http://python123.io/ws/demo.html')demo = r.textsoup = BeautifulSoup(demo,'html.parser')for parent in soup.a.parents: if parent is None:print(parent) else:print(parent.name)

pbody html [document]標簽的平行遍歷屬性說明 .next_sibling 返回按照HTML文本順序的下一個平行節點標簽 .previous.sibling 返回按照HTML文本順序的上一個平行節點標簽 .next_siblings 迭代類型，返回按照HTML文本順序的后續所有平行節點標簽 .previous.siblings 迭代類型，返回按照HTML文本順序的前續所有平行節點標簽

import requestsfrom bs4 import BeautifulSoupr = requests.get('http://python123.io/ws/demo.html')demo = r.textsoup = BeautifulSoup(demo,'html.parser')print(soup.a.next_sibling)print(soup.a.next_sibling.next_sibling)print(soup.a.previous_sibling)print(soup.a.previous_sibling.previous_sibling)print(soup.a.parent)

and <a id='link2'>Advanced Python</a>Python is a wonderful general-purpose programming language. You can learn Python from novice to professional by tracking the following courses:NonePython is a wonderful general-purpose programming language. You can learn Python from novice to professional by tracking the following courses:<a id='link1'>Basic Python</a> and <a id='link2'>Advanced Python</a>.

for sibling in soup.a.next_sibling:print(sibling) #遍歷后續節點for sibling in soup.a.previous_sibling:print(sibling) #遍歷前續節點

python beautiful soup庫入門安裝教程

bs庫的prettify()方法

import requestsfrom bs4 import BeautifulSoupr = requests.get('http://python123.io/ws/demo.html')demo = r.textsoup = BeautifulSoup(demo,'html.parser')print(soup.prettify())

<html> <head> <title> This is a python demo page </title> </head> <body> The demo python introduces several python courses. Python is a wonderful general-purpose programming language. You can learn Python from novice to professional by tracking the following courses: Basic Python </a> and <a id='link2'> Advanced Python </a> . </body></html>

.prettify()為HTML文本<>及其內容增加更加’n’.prettify()可用于標簽，方法：.prettify()

bs4庫的編碼

bs4庫將任何HTML輸入都變成utf-8編碼python 3.x默認支持編碼是utf-8,解析無障礙

import requestsfrom bs4 import BeautifulSoupsoup = BeautifulSoup('中文','html.parser')print(soup.p.string)print(soup.p.prettify())

中文 中文

到此這篇關于python beautiful soup庫入門安裝教程的文章就介紹到這了,更多相關python beautiful soup庫入門內容請搜索好吧啦網以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持好吧啦網！

Python 編程

上一條：Python BeautifulSoup基本用法詳解(通過標簽及class定位元素)下一條：Python torch.flatten()函數案例詳解

相關文章：

1. IDEA EasyCode 一鍵幫你生成所需代碼2. Ajax引擎 ajax請求步驟詳細代碼3. Java構建JDBC應用程序的實例操作4. Spring應用拋出NoUniqueBeanDefinitionException異常的解決方案5. ThinkPHP5 通過ajax插入圖片并實時顯示(完整代碼)6. javascript設計模式 ? 建造者模式原理與應用實例分析7. 一篇文章帶你了解JavaScript-對象8. Python使用oslo.vmware管理ESXI虛擬機的示例參考9. IntelliJ IDEA設置條件斷點的方法步驟10. Express 框架中使用 EJS 模板引擎并結合 silly-datetime 庫進行日期格式化的實現方法

排行榜

					
					Java構建JDBC應用程序的實例操作
IDEA EasyCode 一鍵幫你生成所需代碼
ThinkPHP5 通過ajax插入圖片并實時顯示(完整代碼)
Python使用oslo.vmware管理ESXI虛擬機的示例參考
一篇文章帶你了解JavaScript-對象
Docker 部署 Prometheus的安裝詳細教程
Express 框架中使用 EJS 模板引擎并結合 silly-datetime 庫進行日期格式化的實現方法
javascript設計模式 ? 建造者模式原理與應用實例分析
IntelliJ IDEA設置條件斷點的方法步驟
Ajax引擎 ajax請求步驟詳細代碼
Spring應用拋出NoUniqueBeanDefinitionException異常的解決方案
				