Hello! I'm Peter and if you need someone to extract data from a website, an app or some large/messy database, I'm here to help

Web scraping with Python. Basic tutorial


Web scraping with Python. Basic tutorial Assuming you have some basic knowledge of HTML and web development, web scraping is relatively simple. In its most basic form, web scraping is about making HTTP requests to a website and then parsing the response. The response is usually in HTML format, which means it can be parsed using a library like BeautifulSoup.

To make a request, you can use a library like requests. For example, to make a GET request to a website, you would do the following:

import requests

r = requests.get('http://www.example.com')

This would make a GET request to http://www.example.com and store the response in the variable r.

If you want to make a POST request, you would do the following:

import requests

r = requests.post('http://www.example.com', data = {'key': 'value'})

This would make a POST request to http://www.example.com with the data key-value pair.

Once you have made the request, you can access the response data using the following attributes:

r.text # The response data in string format
r.json() # The response data in JSON format
r.content # The response data in byte format

You can also access the response headers using the following attribute:

r.headers # The response headers

And finally, you can check the status code of the response using the following attribute:

r.status_code # The status code of the response

Now that you know how to make requests and access the response data, you can start scraping websites. For example, let's say you want to scrape the title of all the articles on a website. You would first need to find the CSS selector for the titles. You can do this by using your browser's developer tools.

Once you have the CSS selector for the titles, you can use BeautifulSoup to parse the response data and extract the titles. For example:

import requests
from bs4 import BeautifulSoup

r = requests.get('http://www.example.com')
soup = BeautifulSoup(r.text, 'html.parser')
titles = soup.select('.article-title')

for title in titles:
print(title.text)

This would print the text of all the titles on the page.

You can also use BeautifulSoup to make POST requests and submit form data. For example, let's say you want to fill out a form on a website. You would first need to find the form data and the action URL. You can do this by using your browser's developer tools.

Once you have the form data and action URL, you can use BeautifulSoup to submit the form. For example:

import requests
from bs4 import BeautifulSoup

r = requests.get('http://www.example.com')
soup = BeautifulSoup(r.text, 'html.parser')

form = soup.select('form')[0] # select the first form on the page
action = form['action'] # get the action URL
data = {} # create an empty dictionary

for input in form.select('input'): # get all the form inputs
if input['name'] != '': # the input must have a name attribute
data[input['name']] = input['value'] # add the input to the dictionary

r = requests.post(action, data = data) # submit the form

This would submit the form and store the response in the variable r.

You can also use web scraping to login to websites. For example, let's say you want to login to a website. You would first need to find the form data and the action URL. You can do this by using your browser's developer tools.

Once you have the form data and action URL, you can use BeautifulSoup to submit the form. For example:

import requests
from bs4 import BeautifulSoup

r = requests.get('http://www.example.com')
soup = BeautifulSoup(r.text, 'html.parser')

form = soup.select('form')[0] # select the first form on the page
action = form['action'] # get the action URL
data = {} # create an empty dictionary

for input in form.select('input'): # get all the form inputs
if input['name'] != '': # the input must have a name attribute
data[input['name']] = input['value'] # add the input to the dictionary

r = requests.post(action, data = data) # submit the form

This would submit the form and store the response in the variable r.

You can also use web scraping to login to websites. For example, let's say you want to login to a website. You would first need to find the form data and the action URL. You can do this by using your browser's developer tools.

Once you have the form data and action URL, you can use BeautifulSoup to submit the form. For example:

import requests
from bs4 import BeautifulSoup

r = requests.get('http://www.example.com')
soup = BeautifulSoup(r.text, 'html.parser')

form = soup.select('form')[0] # select the first form on the page
action = form['action'] # get the action URL
data = {} # create an empty dictionary

for input in form.select('input'): # get all the form inputs
if input['name'] != '': # the input must have a name attribute
data[input['name']] = input['value'] # add the input to the dictionary

r = requests.post(action, data = data) # submit the form

This would submit the form and store the response in the variable r.

You can also use web scraping to login to websites. For example, let's say you want to login to a website. You would first need to find the form data and the action URL. You can do this by using your browser's developer tools.

Once you have the form data and action URL, you can use BeautifulSoup to submit the form. For example:

import requests
from bs4 import BeautifulSoup

r = requests.get('http://www.example.com')
soup = BeautifulSoup(r.text, 'html.parser')

form = soup.select('form')[0] # select the first form on the page
action = form['action'] # get the action URL
data = {} # create an empty dictionary

for input in form.select('input'): # get all the form inputs
if input['name'] != '': # the input must have a name attribute
data[input['name']] = input['value'] # add the input to the dictionary

r = requests.post(action, data = data) # submit the form

This would submit the form and store the response in the variable r.

You can also use web scraping to login to websites. For example, let's say you want to login to a website. You would first need to find the form data and the action URL. You can do this by using your browser's developer tools.

Once you have the form data and action URL, you can use BeautifulSoup to submit the form. For example:

import requests
from bs4 import BeautifulSoup

r = requests.get('http://www.example.com')
soup = BeautifulSoup(r.text, 'html.parser')

form = soup.select('form')[0] # select the first form on the page
action = form['action'] # get the action URL
data = {} # create an empty dictionary

for input in form.select('input'): # get all the form inputs
if input['name'] != '': # the input must have a name attribute
data[input['name']] = input['value'] # add the input to the dictionary

r = requests.post(action, data = data) # submit the form

This would submit the form and store the response in the variable r.