读BeautifulSoup官方文档之html树的搜索(2)
2016-06-16 17:50
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除了find()和find_all(), 这里还提供了许多类似的方法我就细讲了, 参数和用法都差不多, 最后四个是next, previous是以.next/previous_element()来说的...
Signature: find_parents(name, attrs, string, limit, **kwargs)
Signature: find_parent(name, attrs, string, **kwargs)
Signature: find_next_siblings(name, attrs, string, limit, **kwargs)
Signature: find_next_sibling(name, attrs, string, **kwargs)
Signature: find_previous_siblings(name, attrs, string, limit, **kwargs)
Signature: find_previous_sibling(name, attrs, string, **kwargs)
Signature: find_all_next(name, attrs, string, limit, **kwargs)
Signature: find_next(name, attrs, string, **kwargs)
Signature: find_all_previous(name, attrs, string, limit, **kwargs)
Signature: find_previous(name, attrs, string, **kwargs)
BeautifulSoup也提供CSS选择器, 用法大致与css选择器相同, 我css也只是入门级别, 这里就不多解释了... :
Signature: find_parents(name, attrs, string, limit, **kwargs)
Signature: find_parent(name, attrs, string, **kwargs)
Signature: find_next_siblings(name, attrs, string, limit, **kwargs)
Signature: find_next_sibling(name, attrs, string, **kwargs)
Signature: find_previous_siblings(name, attrs, string, limit, **kwargs)
Signature: find_previous_sibling(name, attrs, string, **kwargs)
Signature: find_all_next(name, attrs, string, limit, **kwargs)
Signature: find_next(name, attrs, string, **kwargs)
Signature: find_all_previous(name, attrs, string, limit, **kwargs)
Signature: find_previous(name, attrs, string, **kwargs)
BeautifulSoup也提供CSS选择器, 用法大致与css选择器相同, 我css也只是入门级别, 这里就不多解释了... :
soup.select("title") # [<title>The Dormouse's story</title>] soup.select("p nth-of-type(3)") # [<p class="story">...</p>] soup.select("body 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>] soup.select("html head title") # [<title>The Dormouse's story</title>] soup.select("head > title") # [<title>The Dormouse's story</title>] soup.select("p > 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>] soup.select("p > a:nth-of-type(2)") # [<a class="sister" href="http://example.com/lacie" id="link2">Lacie</a>] soup.select("p > #link1") # [<a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>] soup.select("body > a") # [] #上面好像看懂了, 应该是 > 的话就是必须是孩子, 空格的话表示子孙. soup.select("#link1 ~ .sister") # [<a class="sister" href="http://example.com/lacie" id="link2">Lacie</a>, # <a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>] soup.select("#link1 + .sister") # [<a class="sister" href="http://example.com/lacie" id="link2">Lacie</a>] soup.select(".sister") # [<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>] soup.select("#link1") # [<a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>] soup.select("a#link2") # [<a class="sister" href="http://example.com/lacie" id="link2">Lacie</a>] #下面好像是通过id寻找 : soup.select("#link1") # [<a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>] soup.select("a#link2") # [<a class="sister" href="http://example.com/lacie" id="link2">Lacie</a>] #匹配任意一个 soup.select(“#link1,#link2”) # [<a class=”sister” href=”http://example.com/elsie” id=”link1”>Elsie</a>, # <a class=”sister” href=”http://example.com/lacie” id=”link2”>Lacie</a>] #当然可以用属性的值来匹配 soup.select('a[href="http://example.com/elsie"]') # [<a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>] soup.select('a[href^="http://example.com/"]') # [<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>] soup.select('a[href$="tillie"]') # [<a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>] soup.select('a[href*=".com/el"]') # [<a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>] #这个真看不懂 multilingual_markup = """ <p lang="en">Hello</p> <p lang="en-us">Howdy, y'all</p> <p lang="en-gb">Pip-pip, old fruit</p> <p lang="fr">Bonjour mes amis</p> """ multilingual_soup = BeautifulSoup(multilingual_markup) multilingual_soup.select('p[lang|=en]') # [<p lang="en">Hello</p>, # <p lang="en-us">Howdy, y'all</p>, # <p lang="en-gb">Pip-pip, old fruit</p>] #选一个可以用select_one() soup.select_one(".sister") # <a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>
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