A Selenium remaining portion
1. elements of interaction :
- Click to clear
click
clear
- ActionChains
Is a chain of action object need driver driving passed it.
Action chain object can operate a series of actions to set a good behavior.
- iframe switch
driver.switch_to.frame('iframeResult')
- the implementation of js codes
execute_script()
from Selenium Import the webdriver
Import Time
Driver = webdriver.Chrome ()
the try :
driver.implicitly_wait (10)
driver.get ( 'https://www.baidu.com/' )
driver.execute_script (
'' ' Alert ( "Animal College, Zhejiang most cowhide college ")! '' ' ) the time.sleep (10) a finally : driver.close ()
Two BeautifulSoup4
BS4
1. What BeautifulSoup ?
bs4 is a resolver library, can in some ( resolver ) to help extract the data we want.
2. Why use BS4 ?
Because it can quickly extract the data content users want through simple syntax.
3. Classification parser
- lxml
- html.parser
4. Installation and Use
- traverse the document tree
- Search document tree
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))
html = soup.prettify()
print(html)
Supplementary knowledge :
Data formats :
json data :
{
"name": "tank"
}
XML data :
<name>tank</name>
HTML:
<html></html>
Builder : yield value (the value into the builder)
def f():
# return 1
yield 1
yield 2
yield 3
g = f()
print(g)
for line in g:
print(line)
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')
p = soup.find(name='p')
p_s = soup.find_all(name='p')
print(p)
print(p_s)
p = soup.find(name='p', attrs={"id": "p"})
print(p)
tag = soup.find(name='title', text="The Dormouse's story")
print(tag)
tag = soup.find(name='a', attrs={"class": "sister"}, text="Elsie")
print(tag)
import re
a = soup.find(name=re.compile('a'))
print(a)
a_s = soup.find_all(name=re.compile('a'))
print(a_s)
a = soup.find(attrs={"id": re.compile('link')})
print(a)
print(soup.find(name=['a', 'p', 'html', re.compile('a')]))
print(soup.find_all(name=['a', 'p', 'html', re.compile('a')]))
print(soup.find(name=True, attrs={"id": True}))
def have_id_not_class(tag):
if tag.name == 'p' and tag.has_attr("id") and not tag.has_attr("class"):
return tag
print(soup.find_all(name=have_id_not_class))
a = soup.find(id='link2')
print(a)
p = soup.find(class_='sister')
print(p)