Prerequisites: Beautifulsoup
Beautifulsoup is a powerful python module used for web scraping. This article discusses how a specific text can be searched inside a given tag.
INTRODUCTION:
BeautifulSoup is a Python library for parsing HTML and XML documents. It provides a simple and intuitive API for navigating, searching, and modifying the parse tree of an HTML or XML document. It is designed to make it easy to extract data from web pages, and can be used for web scraping, data mining, and other types of data extraction tasks. It is built on the top of the powerful lxml parser, which is very fast and efficient.
BeautifulSoup is often used in combination with other Python libraries such as requests or Selenium to automate the process of downloading and parsing web pages. It can handle malformed or incomplete HTML, which is common in the real world, and provides several methods for searching for tags based on their contents, such as find(), find_all(), and select(). It also has built-in support for searching for tags using regular expressions.
Overall, BeautifulSoup is a valuable tool for anyone working with HTML or XML data, providing a simple and intuitive API for parsing and manipulating data, and it’s widely used in web scraping and data mining tasks.
Approach
- Import module
- Pass the URL
- Request page
- Specify the tag to be searched
- For Search by text inside tag we need to check condition to with help of string function.
- The string function will return the text inside a tag.
- When we will navigate tag then we will check the condition with the text.
- Return text
We will see search text inside a tag by two method.
Method 1: iterative
This method uses for loop for to search for the text.
Example
Python3
from bs4 import BeautifulSoupimport requests# sample web page# call get method to request that pagepage = requests.get(sample_web_page)# with the help of beautifulSoup and html parser create soupsoup = BeautifulSoup(page.content, "html.parser")child_soup = soup.find_all('strong')text = 'page table base register (PTBR)'# we will search the tag with in which text is same as given textfor i in child_soup: if(i.string == text): print(i) |
Output
<strong>page table base register (PTBR)</strong>
Method 2: Using lambda
It is a one liner alternative of the above example.
Example
Python3
from bs4 import BeautifulSoupimport requests# sample web page# call get method to request that pagepage = requests.get(sample_web_page)# with the help of beautifulSoup and html parser create soupsoup = BeautifulSoup(page.content, "html.parser")text = 'CS Theory Course'# Search by text with the help of lambda functiongfg = soup.find_all(lambda tag: tag.name == "strong" and text in tag.text)print(gfg) |
Output
[<strong>CS Theory Course</strong>]
IMPORTANTS POINTS:
Here are some important points to consider when using BeautifulSoup to search for text inside a tag:
BeautifulSoup provides several methods for searching for tags based on their contents, such as find(), find_all(), and select().
The find_all() method returns a list of all tags that match a given filter, while the find() method returns the first tag that matches the filter.
You can use the text keyword argument to search for tags that contain specific text.
You can also use regular expressions to search for text inside a tag.
ADVANTAGES AND DISADVANTAGES:
Advantages of BeautifulSoup:
- It is easy to use and understand, making it a great choice for beginners.
- It is very flexible and can handle a wide variety of HTML and XML documents.
- It can handle malformed or incomplete HTML, which is common in the real world.
- BeautifulSoup is built on the top of the powerful lxml parser, which is very fast and efficient.
Disadvantages of BeautifulSoup:
- It can be slow when working with very large documents.
- It may not be as efficient as using a specialized library for parsing XML or JSON.
- It does not support Xpath, which can make it more difficult to navigate complex documents.
