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Python 3 Tutorial: Changing User-Agent for urllib.request.urlopen

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th?q=Changing User Agent In Python 3 For Urrlib.Request - Python 3 Tutorial: Changing User-Agent for urllib.request.urlopen

If you are an enthusiastic Python programmer, you might have come across the need to change User-Agent while using urllib.request.urlopen. User-Agent acts as a unique identifier for every request sent from your machine. By default, Python sets User-Agent to Python/3.X, where X is the version of Python you are running. However, sometimes you might want to change this User-Agent for various reasons. For instance, if you want your requests to resemble those made by a browser, you will need to modify it.

Fortunately, altering User-Agent for urllib.request.urlopen is not complicated. In this Python 3 tutorial, we will show you how to change User-Agent in just a few simple steps. We will cover some examples that demonstrate how to do it efficiently, whether you are sending a request purely in Python or with other powerful libraries like Requests.

Don’t miss the chance to learn how to customize User-Agent for your Python requests successfully. Follow our step-by-step guide and become a pro in modifying User-Agent for urllib.request.urlopen. Whether you are a seasoned Python developer or just starting with the language, this tutorial will provide you with valuable insights that will come in handy while working on various Python projects. Read on to discover how to change User-Agent and why it’s essential in today’s web development world.

th?q=Changing%20User%20Agent%20In%20Python%203%20For%20Urrlib.Request - Python 3 Tutorial: Changing User-Agent for urllib.request.urlopen
“Changing User Agent In Python 3 For Urrlib.Request.Urlopen” ~ bbaz

Python 3 Tutorial: Changing User-Agent for urllib.request.urlopen


Python is one of the most popular programming languages in the world, thanks to its user-friendly syntax and powerful capabilities. One of the most important libraries in Python is urllib, which allows you to perform a wide range of HTTP requests. This tutorial will guide you on how to change the User-Agent for ‘urllib.request.urlopen’ in Python 3.

The Importance of User-Agent

User-Agent is a header that is sent along with an HTTP request to identify the client application making the request. It is commonly used by servers to provide different web pages or content based on the requesting client. For example, a website may provide a mobile-optimized version of its page if it detects that the user is using a mobile device. Changing the User-Agent can help you access restricted content or overcome firewall restrictions.

Using urllib.request.urlopen()

‘urllib.request.urlopen()’ is a function in the ‘urllib’ library that can be used to open URLs. By default, it sends a User-Agent header with the value ‘Python-urllib/x.y’, where ‘x.y’ is the current Python version. This header can be manipulated to include your own User-Agent string.

Setting User-Agent

To change User-Agent, you need to create a new ‘Request’ object and add the User-Agent header to it. You can then pass this object as an argument to the ‘urllib.request.urlopen()’ function. Here is an example of how to change the User-Agent to ‘Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3’:“`pythonimport urllib.requesturl = ‘’req = urllib.request.Request(url, headers={‘User-Agent’: ‘Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3’})response = urllib.request.urlopen(req)print(“`This will send a request to ‘’ with the User-Agent header set to the value specified.

Comparison between User-Agent Strings

Here’s a table comparing different User-Agent strings that you can use:| User-Agent String | Description || — | — || Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3 | Google Chrome on Windows 10 || Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; AS; rv:11.0) like Gecko | Microsoft Internet Explorer 11 on Windows 10 || Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Safari/604.1.38 | Safari on macOS Sierra || Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1 | Safari on iOS 11.0 || Mozilla/5.0 (Android 8.0.0; Mobile; rv:57.0) Gecko/57.0 Firefox/57.0 | Mozilla Firefox on Android 8.0.0 |


Changing the User-Agent for ‘urllib.request.urlopen’ is a useful technique for accessing websites that may block Python’s default User-Agent. It can also be used to simulate different client applications to test how a website responds to different devices and browsers. However, it’s important to note that misusing User-Agent headers can violate a website’s terms of service or even be illegal in some cases. So, use this technique responsibly and ethically.

Dear readers,

We hope that you have found this Python 3 tutorial on changing User-Agent for urllib.request.urlopen informative and useful. As we know, urllib is a package that allows us to download data from the internet in Python. However, there may be times when we need to change the User-Agent string to access certain websites or data. In such scenarios, understanding how to change the User-Agent for urllib.request.urlopen can prove useful.

In this tutorial, we have covered how to create a basic Python script to change the User-Agent string for urllib.request.urlopen. We have discussed how User-Agent strings work and how they help server administrators to identify the type of client accessing their website. Additionally, we outlined the step-by-step process of importing the required libraries, changing the User-Agent string, and requesting data using urllib.request.urlopen in Python.

We hope that this tutorial has helped you to better understand how implementation of User-Agent strings works with urllib.request.urlopen. By changing the User-Agent string, you can access more data and information from different websites. Please keep visiting our website for more valuable tutorials on Python programming and other exciting topics. Thank you for reading and happy coding!

People also ask about Python 3 Tutorial: Changing User-Agent for urllib.request.urlopen:

  1. What is urllib.request.urlopen in Python?
  2. The urllib.request.urlopen() function in Python is used to open URLs. It can be used to retrieve data from the internet by making a request to a URL.

  3. How do I change the User-Agent for urllib.request.urlopen in Python?
  4. You can change the User-Agent header for urllib.request.urlopen by using the Request object. Here’s an example:

  • Import the urllib.request module and the Request class from urllib.request.
  • Create a Request object with the URL you want to request.
  • Add a User-Agent header to the Request object using the add_header() method.
  • Pass the Request object to the urllib.request.urlopen() method.

Here’s the code:

import urllib.requestfrom urllib.request import Requesturl = ''req = Request(url)req.add_header('User-Agent', 'Mozilla/5.0')response = urllib.request.urlopen(req)html =
  • Why would I need to change the User-Agent for urllib.request.urlopen in Python?
  • You might need to change the User-Agent for urllib.request.urlopen in Python if the website you are requesting from blocks requests from certain User-Agents. By changing the User-Agent to a common browser, such as Mozilla Firefox, you can trick the website into thinking that your request is coming from a legitimate browser.