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  • bs4

    2019-09-20 16:11:33
    bs4安装与使用 '''''' ''' 安装解析器: pip3 install lxml 安装解析库: pip3 install bs4 ''' html_doc = """ <html><head><title>The Dormouse's story</title></head> ...
    一、
    bs4安装与使用

    '''''' ''' 安装解析器: pip3 install lxml 安装解析库: pip3 install bs4 ''' 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> """ from bs4 import BeautifulSoup # python自带的解析库 # soup = BeautifulSoup(html_doc, 'html.parser') # 调用bs4得到一个soup对象 soup = BeautifulSoup(html_doc, 'lxml') # bs4对象 print(soup) # bs4类型 print(type(soup)) # 美化功能 html = soup.prettify() print(html)
    二、bs4解析库之遍历文档树

    ''''''
    '''
    安装解析器:
    pip3 install lxml
    
    安装解析库:
    pip3 install bs4
    '''
    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>
    """
    from bs4 import BeautifulSoup
    
    # python自带的解析库
    # soup = BeautifulSoup(html_doc, 'html.parser')
    
    # 调用bs4得到一个soup对象
    soup = BeautifulSoup(html_doc, 'lxml')
    
    # bs4对象
    print(soup)
    
    # bs4类型
    print(type(soup))
    
    # 美化功能
    html = soup.prettify()
    print(html)

    三、bs4解析库之遍历文档树
    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>
    """
    from bs4 import BeautifulSoup
    
    soup = BeautifulSoup(html_doc, 'lxml')
    # print(soup)
    # print(type(soup))
    # 遍历文档树
    # 1、直接使用  *****
    print(soup.html)
    print(type(soup.html))
    print(soup.a)
    print(soup.p)
    
    # 2、获取标签的名称
    print(soup.a.name)
    
    # 3、获取标签的属性   *****
    print(soup.a.attrs)  # 获取a标签中所有的属性
    print(soup.a.attrs['href'])
    
    # 4、获取标签的文本内容  *****
    print(soup.p.text)  # $37
    
    # 5、嵌套选择
    print(soup.html.body.p)
    
    # 6、子节点、子孙节点
    print(soup.p.children)  # 返回迭代器对象
    print(list(soup.p.children))  # [<b>$37</b>]
    
    # 7、父节点、祖先节点
    print(soup.b.parent)
    print(soup.b.parents)
    print(list(soup.b.parents))
    
    # 8、兄弟节点  (sibling: 兄弟姐妹)
    print(soup.a)
    # 获取下一个兄弟节点
    print(soup.a.next_sibling)
    
    # 获取下一个的所有兄弟节点,返回的是一个生成器
    print(soup.a.next_siblings)
    print(list(soup.a.next_siblings))
    
    # 获取上一个兄弟节点
    print(soup.a.previous_sibling)
    # 获取上一个的所有兄弟节点,返回的是一个生成器
    print(list(soup.a.previous_siblings))

    四、bs4之搜索文档树
    ''''''
    '''
    find: 找第一个
    find_all: 找所有
    
    标签查找与属性查找:
    name 属性匹配
    
        name 标签名
        attrs 属性查找匹配
        text 文本匹配
                
        标签:
            - 字符串过滤器   
                字符串全局匹配
                
            - 正则过滤器
                re模块匹配
                
            - 列表过滤器
                列表内的数据匹配
                
            - bool过滤器
                True匹配
                
            - 方法过滤器
                用于一些要的属性以及不需要的属性查找。
        属性:
            - 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>
    """
    from bs4 import BeautifulSoup
    
    soup = BeautifulSoup(html_doc, 'lxml')
    
    # name 标签名
    # attrs 属性查找匹配
    # text 文本匹配
    # find与find_all搜索文档
    
    '''
    
    字符串过滤器
    '''
    p = soup.find(name='p')
    p_s = soup.find_all(name='p')
    
    print(p)
    print(p_s)
    
    # name + attrs
    p = soup.find(name='p', attrs={"id": "p"})
    print(p)
    
    # name + text
    tag = soup.find(name='title', text="The Dormouse's story")
    print(tag)
    
    # name + attrs + text
    tag = soup.find(name='a', attrs={"class": "sister"}, text="Elsie")
    print(tag)
    
    '''
    - 正则过滤器
    re模块匹配
    '''
    import re
    # name
    # 根据re模块匹配带有a的节点
    a = soup.find(name=re.compile('a'))
    print(a)
    
    a_s = soup.find_all(name=re.compile('a'))
    print(a_s)
    
    
    # attrs
    a = soup.find(attrs={"id": re.compile('link')})
    print(a)
    
    
    # - 列表过滤器
    # 列表内的数据匹配
    print(soup.find(name=['a', 'p', 'html', re.compile('a')]))
    print(soup.find_all(name=['a', 'p', 'html', re.compile('a')]))
    
    
    # - bool过滤器
    # True匹配
    print(soup.find(name=True, attrs={"id": True}))
    
    # - 方法过滤器
    # 用于一些要的属性以及不需要的属性查找。
    
    def have_id_not_class(tag):
        # print(tag.name)
        if tag.name == 'p' and tag.has_attr("id") and not tag.has_attr("class"):
            return tag
    
    # print(soup.find_all(name=函数对象))
    print(soup.find_all(name=have_id_not_class))
    
    
    # 补充知识点:
    # id
    a = soup.find(id='link2')
    print(a)
    
    # class
    p = soup.find(class_='sister')
    print(p)



    转载于:https://www.cnblogs.com/yijingjing/p/11129660.html

    展开全文
  • BS4解析库

    2019-11-29 15:07:27
    Beautiful Soup4解析库 一、简介 1.简介 BeautifulSoup 是一个从HTML或XML文件中提取数据的...2.安装 pip install beautifulsoup4 3.官方中文文档 https://www.crummy.com/software/BeautifulSoup/bs4/doc/inde...

    Beautiful Soup4解析库

    一、简介

    1.简介

    BeautifulSoup 是一个从HTML或XML文件中提取数据的Python解析库,使用方式简单方便,借助网页的结构和属性等特性来解析网页

    2.安装

    pip install beautifulsoup4

    3.官方中文文档

    https://www.crummy.com/software/BeautifulSoup/bs4/doc/index.zh.html

    二、解析器

    1.解析器

    解析器 使用方法 优势 劣势
    Python标准库 BeautifulSoup(markup, “html.parser”) Python的内置标准库执行速度适中、文档容错能力强 Python 2.7.3 or 3.2.2之前 的版本中文档容错能力差
    lxml HTML解析器 BeautifulSoup(markup, “lxml”) 速度快、文档容错能力强 需要安装C语言库
    lxml XML解析器 BeautifulSoup(markup, [“lxml”, “xml”]) 速度快、唯一支持XML的解析器 需要安装C语言库
    html5lib BeautifulSoup(markup, “html5lib”) 最好的容错性、以浏览器的方式解析文档生成HTML5格式的文档 速度慢、不依赖外部扩展

    lxml解析器有解析HTML和XML的功能,速度快,容错力强,推荐使用

    2.初始化

    from bs4 import BeautifulSoup
    
    html_doc = ""
    soup = BeautifulSoup(html_doc, "lxml")	# html_doc为HTML字符串,"lxml"为解析器的类型
    print(type(soup))		# <class 'bs4.BeautifulSoup'>
    

    3.基本用法

    from bs4 import BeautifulSoup
    
    html_doc = """
    <html><head><title>The Dormouse's story</title></head>
    <body>
    <p class="title"><b>The Dormouse's story</b></p>
    
    <p class="story">Once upon a time there were three little sisters; and their names were
    <a href="http://example.com/elsie" class="sister" id="link1">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>
    """
    soup = BeautifulSoup(html_doc, "lxml")
    print(soup.prettify())	# 把要解析的字符串以标准的缩进格式输出,并且自动更正
    
    ************************************************************************
    <html>
     <head>
      <title>
       The Dormouse's story
      </title>
     </head>
     <body>
      <p class="title">
       <b>
        The Dormouse's story
       </b>
      </p>
      <p class="story">
       Once upon a time there were three little sisters; and their names were
       <a class="sister" href="http://example.com/elsie" id="link1">
        Elsie
       </a>
       ,
       <a class="sister" href="http://example.com/lacie" id="link2">
        Lacie
       </a>
       and
       <a class="sister" href="http://example.com/tillie" id="link3">
        Tillie
       </a>
       ;
    and they lived at the bottom of a well.
      </p>
      <p class="story">
       ...
      </p>
     </body>
    </html>
    

    三、节点选择器

    1.选择元素

    直接用节点名称选择节点元素,当有多个节点时只会匹配第一个节点,后面的会被忽略

    from bs4 import BeautifulSoup
    
    html_doc = """
    <html><head><title>The Dormouse's story</title></head>
    <body>
    <p class="title"><b>The Dormouse's story</b></p>
    
    <p class="story">Once upon a time there were three little sisters; and their names were
    <a href="http://example.com/elsie" class="sister" id="link1">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>
    """
    soup = BeautifulSoup(html_doc, "lxml")
    print(soup.title)
    print(type(soup.title))		# 为Tag类型
    print(soup.a)	# 多个节点只匹配第一个
    **********************************************************************
    <title>The Dormouse's story</title>
    <class 'bs4.element.Tag'>
    <a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>
    

    2.提取信息

    • 获取名称:name
    • 获取所有属性:attrs 返回结果是字典形式
    • 获取某个属性:attrs[“要获取的属性”]、节点元素[“要获取的属性”]
    • 获取内容:string 返回结果是NavigableString类型
    • 获取内容:get_text() 返回结果是字符串类型
    from bs4 import BeautifulSoup
    
    html_doc = """
    <html><head><title>The Dormouse's story</title></head>
    <body>
    <p class="title"><b>The Dormouse's story</b></p>
    
    <p class="story">Once upon a time there were three little sisters; and their names were
    <a href="http://example.com/elsie" class="sister" id="link1">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>
    """
    soup = BeautifulSoup(html_doc, "lxml")
    print(soup.a.name)
    print(soup.a.attrs)
    print(soup.a.attrs["id"])
    print(soup.a["id"])
    print(soup.title.string)
    print(type(soup.title.string))
    print(soup.title.get_text())
    print(type(soup.title.get_text()))
    **********************************************************************
    a
    {'href': 'http://example.com/elsie', 'class': ['sister'], 'id': 'link1'}
    link1
    link1
    The Dormouse's story
    <class 'bs4.element.NavigableString'>
    The Dormouse's story
    <class 'str'>
    

    3.嵌套选择

    Tag类型的基础上在此选择得到的依旧是Tag类型,因此能够嵌套选择

    from bs4 import BeautifulSoup
    
    html_doc = """
    <html><head><title>The Dormouse's story</title></head>
    <body>
    <p class="title"><b>The Dormouse's story</b></p>
    
    <p class="story">Once upon a time there were three little sisters; and their names were
    <a href="http://example.com/elsie" class="sister" id="link1">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>
    """
    soup = BeautifulSoup(html_doc, "lxml")
    print(soup.head.title)
    print(type(soup.head.title))
    print(soup.head.title.string)
    **********************************************************************
    <title>The Dormouse's story</title>
    <class 'bs4.element.Tag'>
    The Dormouse's story
    

    4.关联选择

    • 直接子节点:contents 返回结果是列表形式

    • 直接子节点:children 返回结果是生成器类型

    • 所有子孙节点:descendants 返回结果是生成器类型(它会递归查询所有的子节点,得到所有的子孙节点)

    • 父节点:parent

    • 祖先节点:parents 返回结果是生成器类型

    • 下一个兄弟节点:next_sibling

    • 上一个兄弟节点:previous_sibling

    from bs4 import BeautifulSoup
    
    html_doc = """
    <html><head><title>The Dormouse's story</title></head>
    <body>
    <p class="title"><b>The Dormouse's story</b></p>
    
    <p class="story">Once upon a time there were three little sisters; and their names were
    <a href="http://example.com/elsie" class="sister" id="link1">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>
    """
    soup = BeautifulSoup(html_doc, "lxml")
    print("="*30 + "直接子节点")
    print(soup.head.contents, type(soup.head.contents))
    print(soup.head.children, type(soup.head.children))
    print("="*30 + "所有子孙节点")
    print(soup.head.descendants, type(soup.head.descendants))
    for child in soup.head.descendants:
        print(child)
    print("="*30 + "父节点")
    print(soup.head.parent, type(soup.head.parent))
    print("="*30 + "祖先节点")
    print(soup.head.parents, type(soup.head.parents))
    print("="*30 + "兄弟节点")
    print(soup.a.next_sibling, type(soup.a.next_sibling))
    print(soup.a.previous_sibling, type(soup.a.previous_sibling))
    **********************************************************************
    ==============================直接子节点
    [<title>The Dormouse's story</title>] <class 'list'>
    <list_iterator object at 0x000002DFCB0F69E8> <class 'list_iterator'>
    ==============================所有子孙节点
    <generator object Tag.descendants at 0x000002DFCB0C69A8> <class 'generator'>
    <title>The Dormouse's story</title>
    The Dormouse's story
    ==============================父节点
    <html><head><title>The Dormouse's story</title></head>
    <body>
    <p class="title"><b>The Dormouse's story</b></p>
    <p class="story">Once upon a time there were three little sisters; and their names were
    <a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>,
    <a class="sister" href="http://example.com/lacie" id="link2">Lacie</a> and
    <a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>;
    and they lived at the bottom of a well.</p>
    <p class="story">...</p>
    </body></html> <class 'bs4.element.Tag'>
    ==============================祖先节点
    <generator object PageElement.parents at 0x000002DFCB0C69A8> <class 'generator'>
    ==============================兄弟节点
    ,
     <class 'bs4.element.NavigableString'>
    Once upon a time there were three little sisters; and their names were
     <class 'bs4.element.NavigableString'>
    

    四、方法选择器

    1.find_all()

    查询所有符合条件的元素,返回结果为列表形式

    find_all(self, name=None, attrs={}, recursive=True, text=None, limit=None, **kwargs)
    
    • name:匹配节点名
    • attrs:匹配属性的键值对
    • text:匹配节点的文本
    from bs4 import BeautifulSoup
    
    html_doc = """
    <html><head><title>The Dormouse's story</title></head>
    <body>
    <p class="title"><b>The Dormouse's story</b></p>
    
    <p class="story">Once upon a time there were three little sisters; and their names were
    <a href="http://example.com/elsie" class="sister" id="link1">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>
    """
    soup = BeautifulSoup(html_doc, "lxml")
    print(soup.find_all(name="a"))
    print(soup.find_all(name="a")[0])
    print(soup.find_all(attrs={"id": "link1"}))
    print(soup.find_all(text="Elsie"))
    **********************************************************************
    [<a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>, <a class="sister" href="http://example.com/lacie" id="link2">Lacie</a>, <a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>]
    <a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>
    [<a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>]
    ['Elsie']
    

    2.find()

    返回第一个匹配的元素

    from bs4 import BeautifulSoup
    
    html_doc = """
    <html><head><title>The Dormouse's story</title></head>
    <body>
    <p class="title"><b>The Dormouse's story</b></p>
    
    <p class="story">Once upon a time there were three little sisters; and their names were
    <a href="http://example.com/elsie" class="sister" id="link1">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>
    """
    soup = BeautifulSoup(html_doc, "lxml")
    print(soup.find(name="a"))
    **********************************************************************
    <a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>
    

    3.其他

    五、CSS选择器

    1.select()

    调用select方法,传入相应的CSS选择器,返回结果为列表形式,支持嵌套选择

    from bs4 import BeautifulSoup
    
    html_doc = """
    <html><head><title>The Dormouse's story</title></head>
    <body>
    <p class="title"><b>The Dormouse's story</b></p>
    
    <p class="story">Once upon a time there were three little sisters; and their names were
    <a href="http://example.com/elsie" class="sister" id="link1">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>
    """
    soup = BeautifulSoup(html_doc, "lxml")
    print(soup.select('title'))
    print(soup.select('#link1'))
    print(soup.select('.sister'))
    **********************************************************************
    [<title>The Dormouse's story</title>]
    [<a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>]
    [<a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>, <a class="sister" href="http://example.com/lacie" id="link2">Lacie</a>, <a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>]
    

    2.获取属性

    直接传入[“属性名”],或者通过attrs[“属性名”]

    from bs4 import BeautifulSoup
    
    html_doc = """
    <html><head><title>The Dormouse's story</title></head>
    <body>
    <p class="title"><b>The Dormouse's story</b></p>
    
    <p class="story">Once upon a time there were three little sisters; and their names were
    <a href="http://example.com/elsie" class="sister" id="link1">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>
    """
    soup = BeautifulSoup(html_doc, "lxml")
    print(soup.select('a')[0]["id"])
    print(soup.select('a')[0]["class"])		# class属性返回结果为列表
    print(soup.select('a')[0].attrs["class"])
    print(soup.select('a')[0].attrs["href"])
    **********************************************************************
    link1
    ['sister']
    ['sister']
    http://example.com/elsie
    
    展开全文
  • Python小白,学习时候用到bs4解析网站,报错 bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library? 几经周折才知道是bs4调用了...

    Python小白,学习时候用到bs4解析网站,报错

    bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?

    几经周折才知道是bs4调用了python自带的html解析器,我用的mac,默认安装的是python2,所以内置的解释器也是捆绑在python2上,而我学习的时候又自己安装了python3,开发环境也是python3的,貌似是没有html解释器,所以会报错。
    问题找到了,那么怎么解决呢?对,在python3也装一个html解析器就好了,那么怎么安装呢?查阅资料获悉:一般pip和pip2对应的是python2.x,pip3对应的是python3.x的版本,python2和python3的模块是独立的,不能混用,混用会出问题。所以命令行通过python3的pip:pip3 安装解析器:

    $ pip3 install lxml

    3.8M,稍等片刻即可
    再次运行项目,完美解决,特此记录

    说的直白点就是你的开发环境下下载的包里不存在你需要的lxml,比如说你用的是py2,但是把包装到了py3的包路径下,当然就找不到了,反之亦然。那么就检查一下当前的开发环境是用的Python版本和对应的Python版本下的Packages目录下有没有你需要的包,如果没有就安装一个。就是这么简单。

    $ pip3(如果是py2就用pip) show lxml

    如果已经安装了就会显示包的位置及信息,没有则会报错,执行上一步安装操作即可

    展开全文
  • ** 主要用到了requests和bs4以及re库: ** 代码我放在了GIthub里了,需要的自取学习,

    **

    主要用到了requests和bs4以及re库:

    **
    代码我放在了Github里了,需要的自取学习,

    • **

    注意自己买营养快线

    **

    展开全文
  • 本文主要分享关于在对应python版本中安装beautifulsoup之后,在代码执行时还会提示“No module named 'bs4'”的问题。首先需要检查一下,自己安装beautifulsoup的版本与用来执行代码的python版本是不是一致的,为了...
  • Python安装Bs4几种方法

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    安装方法一: ...③验证是否可以运行成功,运行cmd执行,引用模块import bs4回车未报错,则证明安装完成,可以正常使用了: 安装方法二(像我们公司这种各种网络限制,使用pip就会出现无法安装,一直循...
  • BS4模块

    2019-02-20 14:17:05
    0. 概括 1. BS4简介 2. BS4的4种对象 3. 使用方法 4. BS4模块的解释器
  • Successfully installed backports.functools-lru-cache-1.6.1 beautifulsoup4-4.9.1 bs4-0.0.1 soupsieve-1.9.6 ``` 3、确实是安装成功了: ``` d@g:~$ pip list |grep bs4 bs4 (0.0.1) ``` 4...
  • python3使用bs4报错bs4.FeatureNotFound

    千次阅读 2018-02-28 11:35:10
    今天使用了一个叫做bs4的包,用来解析xml,但是出了一个问题,记录一下 环境 系统: windows10 python版本: python3.5 代码 soup = BeautifulSoup(xml_data, 'xml') 问题 代码是从以前的项目中复制...
  • bs4用法

    千次阅读 2018-04-23 21:37:48
    beautfulsoup常用的解析器,html.parser(python)自带,速度适中,lxml解析库,...from bs4 import BeautifulSoup import requests res = requests.get(url).text ###标签的选择方法### soup = BeutifulSoup(res,'...
  • requests+bs4批量爬取反爬虫图片网站

    千次阅读 2019-02-27 10:58:23
    导读:爬取反爬虫图片网站 预览效果 遇到的问题: 刚开始爬虫的时候,爬取到的所有图片都是一张重定向推广图片 解决办法:在requests请求头headers中配置Referer属性,指向爬取网站的顶级...from bs4 import Beautif...
  • ``` import bs4,requests,html.parser,smtplib ... need=bs4.BeautifulSoup(res.text,'...bs4.BeautifulSoup第二个参数的三种我都试过了还是找不到 但是用chromeF12中是可以找到id="imgCode"的这一项 求解!!!!
  • BS4使用方法

    万次阅读 2017-12-28 09:33:44
    bs4; 爬虫
  • Python :No module named bs4 说我没有装bs4.

    千次阅读 2018-05-21 11:34:41
    研究了一个晚上,from bs4 import BeautifulSoup报错No module named 'bs4'问题,琢磨了一个方法。首先,我使用的IDE是PyCharm Python版本3.6,在file选项中选择settings选项点进去然后选择Project Interpreter双击...
  • BeautifulSoup4移植到bs4

    2019-09-21 10:44:23
    "你可能在寻找 Beautiful Soup3 的文档,Beautiful Soup 3 目前已经停止开发,我们推荐在现在的项目中使用Beautiful Soup 4, 移植到BS4" 使用方法: 1 from bs4 import Bea...
  • 基于bs4的HTML内容遍历方法

    千次阅读 2017-08-02 10:05:18
      2.标签树的下行遍历   属性 说明 .contents 子节点的列表,将所有儿子节点存入列表 ....children 子节点的迭代类型,与.content类似,用于循环遍历儿子节点 ....descendants 子孙节点的迭代类型,包含所有子孙...
  • bs4和lxml

    千次阅读 2018-11-17 15:12:42
    周所周知,bs4和lxml是非常流行的两个python模块,他们常被用来对抓取的网页进行解析,以便进一步抓取的进行。作为一个爬虫爱好者,今天我来讲讲这两个各自的优点和不足,不对的地方还请各位大神斧正。 ...
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    千次阅读 2018-06-07 18:09:53
    python中Bs4这个包是用来解析网页源码的包,爬虫程序常用这个包解析爬取网页源码进行分析,今天主要介绍这个包的一些基本使用首先安装bs4: Pipinstall bs4创建beautifulsoup对象解析网页源码,首先创建beautifulsoup...
  • bs4基本使用

    千次阅读 2018-04-12 23:26:06
    一、bs4模块基本使用from bs4 import BeautifulSouphtml='''&lt;html&gt;&lt;head&gt;&lt;title&gt;The Dormouse's story&lt;/title&gt;&lt;/head&gt;&lt;body&gt;...
  • Bs4 BeautifulSoup取值

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    从网页获取HTML数据后,获取对应标签、...class 'bs4.element.Tag'&gt;2.通过属性(attrs)获取:tag.attrs通过标签属性获取: tag["class"] 或 tag.get("class")获取对应的内容1. tag...

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