Зміст курсу

Web Scraping with Python (res)

1. HTML Files and DevTools

Intro to Web Scraping First Steps HTML File Structure Hierarchy in the HTML String Methods Attributes DevTools

2. Beautiful Soup

Work with the Library Work with Soup Find/Find_all Find All!

3. CSS Selectors/XPaths

Intro to XPath Attributes in XPath Selectors CSS Selectors CSS Selectors in BeautifulSoup XPath vs CSS Selector

4. Tables

Intro to Tables Ways to Scrape Table Simple Solution for Scraping Challenge

CSS Selectors in BeautifulSoup

To extract the data with the already written CSS Selectors, you can use Selector from the scrapy library. However, we will consider another way to work with CSS Selectors using the library BeautifulSoup from the previous section. To select the data from the file, use the function .select() of the already created BeautifulSoup object:


              12
            
сss_locator = "html > body > div"
print(soup.select(сss_locator))

We know how to navigate through HTML files using attributes. However, we can select all elements with a specified class or id without the tag’s name or path. For example:


              12
            
print(soup.select("#id-1"))
print(soup.select(".class-1"))

In the first line, we select all elements with the id equal to id-1. In the second line, CSS Selector navigates to all tags that belong to the class-1.

You can also go through all elements of your class with for loop:


              1234
            
for link in soup.select(".class-link > a"):
    page = urlopen(link)
    html = page.read().decode("utf-8")
    new_soup = BeautifulSoup(html, "html.parser")

Here we go through all the links of the class class-link and create BeautifulSoup object for each new page.

Keep in mind that instead of urllib.request library you can send every time get request (request for seeing a webpage) to the page using the library requests and .content() function to convert the page to the HTML format:


              1234
            
import requests

page_response = requests.get(url)
page = page_response.content

Завдання

Go through all the links on the main webpage, get their HTML code, and print the titles of each page. Here we will first go through all tags, saving them into a list, and then go through all href attributes of extracted tags to get all URLs of the pages.

Import the library for opening URLs.
Select all a tags using the method .select() and CSS Selector as the parameter. Assign the result to the variable a_tags.
Create the empty list links.
Go through the list a_tags with the for loop and the variable a to extract the attributes href and add them to the empty list links.
During running through each webpage by its link, get the title tag using the method .title of the BeautifulSoup object and print it.

Завдання

Import the library for opening URLs.
Select all a tags using the method .select() and CSS Selector as the parameter. Assign the result to the variable a_tags.
Create the empty list links.
Go through the list a_tags with the for loop and the variable a to extract the attributes href and add them to the empty list links.
During running through each webpage by its link, get the title tag using the method .title of the BeautifulSoup object and print it.

Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів

Все було зрозуміло?

Секція 3. Розділ 5

CSS Selectors in BeautifulSoup


              12
            
сss_locator = "html > body > div"
print(soup.select(сss_locator))

We know how to navigate through HTML files using attributes. However, we can select all elements with a specified class or id without the tag’s name or path. For example:


              12
            
print(soup.select("#id-1"))
print(soup.select(".class-1"))

In the first line, we select all elements with the id equal to id-1. In the second line, CSS Selector navigates to all tags that belong to the class-1.

You can also go through all elements of your class with for loop:


              1234
            
for link in soup.select(".class-link > a"):
    page = urlopen(link)
    html = page.read().decode("utf-8")
    new_soup = BeautifulSoup(html, "html.parser")

Here we go through all the links of the class class-link and create BeautifulSoup object for each new page.


              1234
            
import requests

page_response = requests.get(url)
page = page_response.content

Завдання

Import the library for opening URLs.
Select all a tags using the method .select() and CSS Selector as the parameter. Assign the result to the variable a_tags.
Create the empty list links.
Go through the list a_tags with the for loop and the variable a to extract the attributes href and add them to the empty list links.
During running through each webpage by its link, get the title tag using the method .title of the BeautifulSoup object and print it.

Завдання

Import the library for opening URLs.
Select all a tags using the method .select() and CSS Selector as the parameter. Assign the result to the variable a_tags.
Create the empty list links.
Go through the list a_tags with the for loop and the variable a to extract the attributes href and add them to the empty list links.
During running through each webpage by its link, get the title tag using the method .title of the BeautifulSoup object and print it.

Все було зрозуміло?

Секція 3. Розділ 5

CSS Selectors in BeautifulSoup


              12
            
сss_locator = "html > body > div"
print(soup.select(сss_locator))

We know how to navigate through HTML files using attributes. However, we can select all elements with a specified class or id without the tag’s name or path. For example:


              12
            
print(soup.select("#id-1"))
print(soup.select(".class-1"))

In the first line, we select all elements with the id equal to id-1. In the second line, CSS Selector navigates to all tags that belong to the class-1.

You can also go through all elements of your class with for loop:


              1234
            
for link in soup.select(".class-link > a"):
    page = urlopen(link)
    html = page.read().decode("utf-8")
    new_soup = BeautifulSoup(html, "html.parser")

Here we go through all the links of the class class-link and create BeautifulSoup object for each new page.


              1234
            
import requests

page_response = requests.get(url)
page = page_response.content

Завдання

Import the library for opening URLs.
Select all a tags using the method .select() and CSS Selector as the parameter. Assign the result to the variable a_tags.
Create the empty list links.
Go through the list a_tags with the for loop and the variable a to extract the attributes href and add them to the empty list links.
During running through each webpage by its link, get the title tag using the method .title of the BeautifulSoup object and print it.

Завдання

Import the library for opening URLs.
Select all a tags using the method .select() and CSS Selector as the parameter. Assign the result to the variable a_tags.
Create the empty list links.
Go through the list a_tags with the for loop and the variable a to extract the attributes href and add them to the empty list links.
During running through each webpage by its link, get the title tag using the method .title of the BeautifulSoup object and print it.

Все було зрозуміло?


              12
            
сss_locator = "html > body > div"
print(soup.select(сss_locator))

We know how to navigate through HTML files using attributes. However, we can select all elements with a specified class or id without the tag’s name or path. For example:


              12
            
print(soup.select("#id-1"))
print(soup.select(".class-1"))

In the first line, we select all elements with the id equal to id-1. In the second line, CSS Selector navigates to all tags that belong to the class-1.

You can also go through all elements of your class with for loop:


              1234
            
for link in soup.select(".class-link > a"):
    page = urlopen(link)
    html = page.read().decode("utf-8")
    new_soup = BeautifulSoup(html, "html.parser")

Here we go through all the links of the class class-link and create BeautifulSoup object for each new page.


              1234
            
import requests

page_response = requests.get(url)
page = page_response.content

Завдання

Import the library for opening URLs.
Select all a tags using the method .select() and CSS Selector as the parameter. Assign the result to the variable a_tags.
Create the empty list links.
Go through the list a_tags with the for loop and the variable a to extract the attributes href and add them to the empty list links.
During running through each webpage by its link, get the title tag using the method .title of the BeautifulSoup object and print it.

Секція 3. Розділ 5