What Does Your User Agent Say About You?


A user agent is a computer program representing a person, for example, a browser in a Web context.

Besides a browser, a user agent could be a bot scraping webpages, a download manager, or another app accessing the Web. Along with each request they make to the server, browsers include a self-identifying User-Agent HTTP header called a user agent (UA) string. This string often identifies the browser, its version number, and its host operating system.

Spam bots, download managers, and some browsers often send a fake UA string to announce themselves as a different client. This is known as user agent spoofing.

The user agent string can be accessed with JavaScript on the client side using the navigator.userAgent property.

A typical user agent string looks like this: "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0".


User Agent String

Browser Data

Python User Agent Library

Christina Perez
• Friday, 30 July, 2021
• 15 min read

Alternatively, you can also get the latest source code from GitHub and install it manually. Various basic information that can help you identify visitors can be accessed browser, device and OS attributes.

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Added get_device(), get_os() and get_browser() instance methods to Sergeant. Properly detect Chrome Mobile browser families.

Files for user -agents, version 2.2.0Filename, sizeable type Python versionUpload dateHashesFilename, size user _agents-2.2.0-py3-none-any.who (9.6 KB) File type Wheel Python version py3 Upload date Aug 23, 2020 HashesFilename, size user -agents-2.2.0.tar.go (9.5 KB) File type Source Python version None Upload date Aug 23, 2020 Hashes The debug information isn’t showing the headers being sent during the request.

If you’re using requests v2.13 and newer The simplest way to do what you want is to create a dictionary and specify your headers directly, like so: If you’re using requests v2.12.x and older versions of requests clobbered default headers, so you’d want to do the following to preserve default headers and then add your own to them.

It’s more convenient to use a session, this way you don’t have to remember to set headers each time: User _agents is a Python library that provides an easy way to identify/detect devices like mobile phones, tablets and their capabilities by parsing (browser/HTTP) user agent strings.

User _agents relies on the excellent parser to do the actual parsing of the raw user agent string. Alternatively, you can also get the latest source code from GitHub and install it manually.

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Various basic information that can help you identify visitors can be accessed browser, device and OS attributes. As for now, these attributes should correctly identify popular platforms/devices, pull requests to support smaller ones are always welcome.

Fixed errors when running against newer versions if parser Support for Python 3 I found out about the Requests library, and I like it.

Making statements based on opinion; back them up with references or personal experience. Pythons Agents user _agents is a Python library that provides an easy way to identify/detect devices like mobile phones, tablets and their capabilities by parsing (browser) user agent strings.

User agent is a mobile, tablet or PC based device User agent has touch capabilities (has touch screen) User _agents relies on the excellent parser to do the actual parsing of the raw user agent string.

Please post feature suggestions, bug or pull requests to identify more devices on GitHub Installation WARNING: This library should be considered “alpha”.

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Alternatively, you can also get the latest source code from GitHub and install it manually. Usage Various basic information that can help you identify visitors can be accessed browser, device and OS attributes.

Running Tests' python -m unit test discover Create your free Platform account to download Active Python or customize Python with the packages you require and get automatic updates.

While the title of these posts says “Urllib2”, we are going to show some examples where you use Ellis, since they are often used together. A program on the Internet can work as a client (access resources) or as a server (makes services available).

Urllib provides the encode method which is used for the generation of GET query strings, urllib2 doesn’t have such a function. Urllib2 offers a very simple interface, in the form of the reopen function.

This function is capable of fetching URLs using a variety of different protocols (HTTP, FTP, …) Just pass the URL to reopen() to get a “file-like” handle to the remote data.

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The return value from reopen() gives access to the headers from the HTTP server through the info() method, and the data for the remote resource via methods like read() and headlines(). Additionally, the file object that is returned by reopen() is iterable.

The difference in this script is that we use ‘WB’, which means that we open the file binary. In its simplest form you create a request object that specifies the URL you want to fetch.

The request function under the urllib2 class accepts both URL and parameter. You can set the outgoing data on the Request to post it to the server.

The example below, use the Mozilla 5.10 as a Sergeant, and that is also what will show up in the web server log file. The prepare module provides functions to analyze URL strings.

It defines a standard interface to break Uniform Resource Locator (URL) strings up in several optional parts, called components, known as (scheme, location, path, query and fragment) When you pass information through a URL, you need to make sure it only uses specific allowed characters.

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The plus sign acts as a special character representing a space in a URL Arguments can be passed to the server by encoding them with and appending them to the URL.

Python ’s encode takes variable/value pairs and creates a properly escaped query string: Terror is the subclass of Error raised in the specific case of HTTP URLs.

Terror Every HTTP response from the server contains a numeric “status code”. Sometimes the status code indicates that the server is unable to fulfill the request.

The default handlers will handle some of these responses for you (for example, if the response is a “redirection” that requests the client fetch the document from a different URL, urllib2 will handle that for you). Typical errors include ‘404’ (page not found), ‘403’ (request forbidden), and ‘401’ (authentication required).

This means that as well as the code attribute, it also has read, return, and info, methods. Sources and further reading For Python training, our top recommendation is Atacama.

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To help you in this, here is an article that brings to you the Top 10 Python Libraries for machine learning which are: There are a lot of reasons why Python is popular among developers and one of them is that it has an amazingly large collection of libraries that users can work with.

Python ’s programming syntax is simple to learn and is of high level when we compare it to C, Java, and C++. The simplicity of Python has attracted many developers to create new libraries for machine learning.

If you are currently working on a machine learning project in Python, then you may have heard about this popular open source library known as TensorFlow. TensorFlow works like a computational library for writing new algorithms that involve many tensor operations, since neural networks can be easily expressed as computational graphs they can be implemented using TensorFlow as a series of operations on Tensors.

TensorFlow is optimized for speed, it makes use of techniques like LA for quick linear algebra operations. With TensorFlow, we can easily visualize each and every part of the graph which is not an option while using Bumpy or Sci Kit.

One of the very important TensorFlow Features is that it is flexible in its durability, meaning it has modularity and the parts of it which you want to make standalone, it offers you that option. Needless to say, if it has been developed by Google, there already is a large team of software engineers who work on stability improvements continuously.

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The best thing about this machine learning library is that it is open source so anyone can use it as long as they have internet connectivity. Lots of training methods like logistics regression and nearest neighbors have received some little improvements.

Bumpy is considered as one of the most popular machine learning library in Python. TensorFlow and other libraries uses Bumpy internally for performing multiple operations on Tensors.

This interface can be utilized for expressing images, sound waves, and other binary raw streams as an array of real numbers in N-dimensional. For implementing this library for machine learning having knowledge of Bumpy is important for full stack developers.

Eras, being modular in nature, is incredibly expressive, flexible, and apt for innovative research. Eras is a completely Python -based framework, which makes it easy to debug and explore.

Eras has also been adopted by researchers at large scientific organizations, in par tic, ular CERN and NASA. PyTorch is the largest machine learning library that allow developers to perform tensor computations wan with acceleration of GPU, creates dynamic computational graphs, and calculate gradients automatically.

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Other than this, PyTorch offers rich APIs for solving application issues related to neural networks. Optimize performance in both research and production by taking advantage of native support for asynchronous execution of collective operations and peer-to-peer communication that is accessible from Python and C++.

It’s built to be deeply integrated into Python so it can be used with popular libraries and packages such as Python and Numb. An active community of researchers and developers have built a rich ecosystem of tools and libraries for extending PyTorch and supporting development in areas from computer vision to reinforcement learning.

It is primarily developed by Facebook’s artificial-intelligence research group and Uber’s “Pro” software for probabilistic programming is built on it. PyTorch is outperforming TensorFlow in multiple ways and it is gaining a lot of attention in the recent days.

Gradient Boosting is one of the best and most popular machine learning library, which helps developers in building new algorithms by using redefined elementary models and namely decision trees. All these libraries are competitors that helps in solving a common problem and can be utilized in almost the similar manner.

It is a combination of visualization and debug all the machine learning models and track all working steps of an algorithm. City library contains modules for optimization, linear algebra, integration, and statistics.


City uses Bumpy arrays as the basic data structure, and comes with modules for various commonly used tasks in scientific programming. Tasks including linear algebra, integration (calculus), ordinary differential equation solving and signal processing execute easily by City.

The actual syntax of Thea no expressions is symbolic, which can be off-putting to beginners used to normal software development. Specifically, expression are defined in the abstract sense, compiled and later actually used to make calculations.

It specifically handles the types of computation for large neural network algorithms in Deep Learning. Pandas is a machine learning library in Python that provides data structures of high-level and a wide variety of tools for analysis.

One of the great feature of this library is the ability to translate complex operations with data using one or two commands. Pandas have so many inbuilt methods for grouping, combining data, and filtering, as well as time-series functionality.

Support for operations such as Re-indexing, Iteration, Sorting, Aggregations, Concatenations and Visualizations are among the feature highlights of Pandas. Currently, there are fewer releases of pandas library which includes a hundred of new features, bug fixes, enhancements, and changes in API.

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The improvements in pandas regard its ability to group and sort data, select best suited output for the apply method, and provides support for performing custom types operations. But, Pandas when used with other libraries and tools ensure high functionality and good amount of flexibility.

The function get_random_UA will always return a unique UA from the text file. If you are going to scrape individual product pages then you can either set relevant category URL in referrer or can find the backlinks of the domain you are going to crawl.

Finding Backlinks via SEMrush you click to view the larger version of the image you could see some links that are pointing to my required category. Look, if you are into serious business then you have to use multiple proxy IPs to avoid blocking.

Majority of websites block crawlers based on the static IP of your server or hosting provider. The site admin will simply put a rule to block all IPs belongs to.

Things you have implemented so far are good to go but there are still some cunning website that asks you to work more, they look for certain request header entries when you access the page and if the certain header is not found they would either block the content or will spoof the content. It’s very easy to mimic the entire request you are going to make on a website.

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I use bumpy.random.choice() for that purpose where I pass a list of random numbers I would like to delay the service: The uncertainty of web scrapers getting block will never go zero but you can always take some steps to avoid it.

Writing scrapers is an interesting journey but you can hit the wall if the site blocks your IP. You do not need to worry about getting blocked because Scraper API by default uses proxies to access websites.

On top of it, you do not need to worry about Selenium either since Scraper API provides the facility of a headless browser too. Click here to sign up with my referral link or enter promo code adnan10, you will get a 10% discount on it.

Planning to write a book about Web Scraping in Python. Developers used to use the user agent to detect if a browser had a given feature, instead of, you know, checking to see if the feature actually existed via object or property detection.

Those days are behind us though, but one of the web's dirty secrets is that the user agent still has many uses. I recently found Tobit Angel's parser, a great repo which provides simple UA parsing in JavaScript, PHP, and Python.

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The code samples above are all easily recognizable by those who can use them; using user agent information is simple, and the API is as well. Now that CSS gradients are supported in Internet Explorer 8+, Firefox, Safari, and Chrome...

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