Top Python Libraries Every Python Developer Should Know in 2022
Tags: python, programming
Published: 2021-10-21 09:51:03

**Introduction**

The Python programming language developed by Guido Van Rossum in the 1990s is ranked as the third most popular programming language in the Stack Overflow Developer Survey 2021. Numpy and Pandas packages of Python are the preferred choices of 33.84% and 28.12% of developers globally and are primarily used in Data Science and Machine Learning.

The Python programming language ranks fourth in terms of the most readily available package, there are high chances that whatever you are trying to build, there is already a package dedicated to it making your life a lot easier. All of these facts are a clear indication of the ever-growing popularity of Python Programming Language. 

The reason for Python being one of the most popular programming language are:-
- Easy-syntax making it beginner friendly and easy to learn.
- Versatility allowing the developers to create a vast range of applications
- Exhaustive collection of libraries. As of 1st September 2021, over 324,836 Python packages can be accessed through PyPI.

This blog introduces the list of top python libraries along with its features and applications. A python library is basically a collection of modules and pre-combined codes that can be used to iteratively reduce the time required to code. Instead of writing the code from scratch Python libraries can be used to access the pre-written frequently used codes. 

Feel free to explore the libraries mentioned below by making [python projects](https://www.interviewbit.com/online-python-compiler/).

###TensorFlow

![TensorFlow](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/v90wr0s8w9iuz8fqo46r.png)

If you are working on Machine Learning based projects or are looking to switch to Machine Learning then there are very high chances that you will use TensorFlow. The TensorFlow library developed by Google in collaboration with the Brain team is a part of almost every google application for Machine Learning. It is ranked as the most popular deep learning framework. 
 
The name “TensorFlow” is derived from the operations that neural networks perform on multidimensional data arrays or tensors, it's literally a flow of tensors. This is primarily used for developing and training highly efficient Machine Learning and Deep Learning Models.
 
TensorFlow works like a computational library for writing new algorithms that involve a large number of 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.

####Features:
The tensorflow library makes use of techniques like XLA to perform linear algebra operations quickly. Let us look at the important features of TensorFlow:
- Easy to train on CPU as well as GPU for distributed computing.
- Tensorflow offers a responsive construct in the sense that each and every part of the graph unlike Numpy or Scikit.
- It is supported by a wide range of operating systems including macOS 10.12.6 (Sierra) and later, Ubuntu 16.04 and later, Windows 7 and above, Raspbian 9.0 or later.
- A large team of software engineers who work on improvements continuously and as it is open source anyone can use it.

####Applications:
TensorFlow has had a huge number of applications in various fields including, Image Classification, Object Detection, Pose Estimation, Speech Recognition, Gesture Recognition, Segmentation, Natural Language Question Answering and Super Resolution. Some of the interesting projects developed using TensorFlow are:

- Deep Speech Developed by Mozilla is a TensorFlow implementation.
- Google Creative Labs Teachable Machine which uses TensorFlow.js it lets you teach using your computer camera, live in the browser.
- Giorgio Camthat lets you make music by clicking pictures is developed using TensorFlow.

###Keras

![Keras](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/21d79lb7z7oda47igt6n.png)

Keras is a powerful and easy to use free open source deep learning API written in Python and built on top of TensorFlow used for developing and evaluating deep learning models.. It has been developed by an artificial intelligence researched at Google named Francois Chollet. Keras is an industry-strength framework that can scale to large clusters of GPU. It wraps the efficient numerical computation libraries, Theano and TensorFlow and allows to define and train neural network models in just a few lines of code. Keras’ impressive deployment capabilities let you deploy your models on a variety of platforms, including web browsers, embedded devices, iOS, and Android devices.

####Features:
In the survey conducted by Developer Committee of Keras in 2019, Keras ranked as #1 for deep learning both among primary frameworks and all other frameworks used.The main features of Keras are:

- Keras integrates deeply with low-level TensorFlow functionality; it enables you to develop highly hackable workflows where any piece of functionality can be customized.
- Deep learning models developed using Keras can be easily deployed on a greater range of platforms including in the browser via TF.js, on Raspberry Pi, on Edge TPU, on server via python runtime as compared to any other deep learning API.
- With over 400,000 individual users as of early 2021, Keras has strong adoption across both the industry and the research community.
- Keras prioritizes developer experience by following best practices for reducing cognitive load, offering consistent and simple APIs and giving clear and actionable feedback upon user error.

####Applications:
There are 10 pretrained models available in Keras. These models are used for image classification and their weights are trained on ImageNet dataset. The models are available in the “applications” module of Keras. Many industries use Keras as their primary deep learning framework:
- It is used by CERN, NASA, NIG and many other scientific organizations around the world.
- Netflix, Uber, Instacart, Zocdoc, Square, and many other have features built with keras.

###PyTorch

![PyTorch](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/2gpox8sui4gt8hpk09b7.png)
The PyTorch library of Python developed by Soumith Chintala in 2017 provides tools and libraries for developing GPU-powered machine learning applications. It allows you to create dynamic computational graphs and calculate gradients automatically. PyTorch also offers a rich API support to solve application issues related to neural networks. One of the most interesting fact about PyTorch is that it offers a C++ interface as well apart from the usual Python interface. The growing developer interest in the PyTorch library since its inception can be attributed to its easy syntax, useful libraries, support for dynamic computation graphs and excellent community support.
![PyTorch Graph](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/9drpuni8xab1ri1gk8x8.png)

####Features:
PyTorch provides a great platform to execute deep learning models with increasing flexibility and speed built to deeply integrate with python. Some of the interesting features of PyTorch are:

- An active community of researchers and developers have built a rich ecosystem of tools and libraries across various domains such as Computer Vision and Natural Language Processing, pro_gan_pytorch to leverage ProGAN features, MUSE for multilingual word embeddings and skorch for fusing scikit-learn code with PyTorch.
- Using PyTorch huge data sets can be efficiently divided into batches which then are sent to multiple GPUs for processing, this way a significant chunk of workload is shifted from CPU to GPU. Thus PyTorch aids in Data Parallelism.
- From version v1.3 of PyTorch, there is support for deployment on Android and iOS devices as well. 

####Applications:
PyTorch gives birth to a range of unique and exciting deep learning projects and libraries. It is primarily used for Natural Language processing. Some of the real-world applications of PyTorch are enlisted below:
- CheXNet helps radiologists detect pneumonia on chest X-rays and is developed using PyTorch.
- Uber’s PYRO, a universal probabilistic programming language, is written in Python and supported by PyTorch on the backend.
	
###Theano

![Theano](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/kp82qk8d7tta3wuizbuj.png)

The Theano library of Python created by  Montreal Institute for Learning Algorithms is used to perform computations on mathematical expressions. It is built on top of Numpy and is used to carry out intensive mathematical and scientific calculations. Theano’s support for GPUs speeds up the computation time up to 140 times than what’s achievable with a CPU. The library can be downloaded easily from PyPI or with the following command “pip install Theano”.

###Features:
Robust capabilities of Theano makes it a quite suitable option for computationally intensive scientific research tasks as well, it's also quite efficient for smaller workloads as well.

- Theano can find out unstable expressions and can use a stable means to calculate them.
- Theano can make use of GPUs to execute parts of expression making it quite faster than Python.
- Theano can detect and diagnose multiple types of errors and ambiguities in the model.

###Applications:

Theano is the strength of multiple neural network projects today and the popularity of Theano is only growing with time. Following are the main application areas of Theano
- It specifically handles the type of computation for large neural network algorithms in deep learning.
- A lot of useful libraries are built on top of theano including Lasagne, Keras, rllab, Blocks, Theano_lgpl, Downhill,  Morb, MonteTheano and many more.

###Scipy

![Spicy](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/vbhmmpbtmj7wtmy44kj7.png)

The SciPy library stands for Scientific Python. It was developed by Numpy’s creator Travis Olliphant. It's predominantly written in Python, and few segments are written in C.

It is a scientific python open source distributed under the BSD licensed library to perform mathematical, scientific and engineering computations. The libraries offered by the entire SciPy ecosystem including Numpy, Matplotlib, Pandas, IPython and SymPy have been curated to provide a convenient library stack that can take on intensive computations from domains like mathematics, science, and engineering, making things easier for data scientists and developers alike.The library is available for download with a simple command “pip install scipy”. It's important to note that although the SciPy stack consists of other libraries as well, you will need to install them separately.

####Features:
It provides many user-friendly and efficient numerical routines, such as routines for numerical integration, interpolation, optimization, linear algebra, and statistics. Some of the important features of Scipy are:
- It contains varieties of sub packages which solve the common issues related to Scientific Computation.
- The SciPy package in Python is the most used Scientific library only second to GNU Scientific Library for C/C++ or Matlab.
- Easy to use and understand as well as fast computational power.
 
####Applications:

The main application areas of Scipy is that it contains modules for various commonly used tasks in scientific programming, including linear algebra, integration (calculus), ordinary differential equation solving, and signal processing.

###Pandas
![Pandas](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/jh9z184j0xql9difsuyu.png)
Pandas library developed by Wes McKinney is a popular high-performance Python library widely used for solving Machine Learning and Data Science Problems. Python with Pandas is used in a wide range of fields including academic and commercial domains including finance, economics, Statistics, analytics, etc.It offers flexible and extremely responsive Data structures for working with time series and structured data along with a stack of other vital features. Pandas have so many inbuilt methods for grouping, combining data, and filtering, as well as time-series functionality.

####Features:
Let us look at the various features of Pandas library in Python:
- It's a foundational library for analytics, data processing and data science.
- Pandas have a fast and efficient DataFrame object which supports default and customized indexing.
- Pandas supports high performance merging and joining of data.
- Pandas also supports label-based slicing, indexing and subsetting of large data sets.

####Applications:
Pandas packages of Python are the preferred choices of 28.12% of developers globally and are primarily used in Data Science and Machine Learning. The major applications of Pandas library in Python are:
- Economists all around the world are using Pandas library's comprehensive set of tools like dataframe and file handling to analyze huge datasets.
- Personalized advertising models which are responsible for showing personalized ads to the customers go through the custom data to learn and understand what the customer wants, to analyze the customer data in such cases Pandas library is used.
- Pandas helps in analytics using its amazing data manipulation and handling capabilities.

###Numpy
![Numpy](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/gxgs2lvnmznd11bonm98.png)

The numpy library developed by Travis Oliphant is the fundamental package for python providing support for large multidimensional arrays and matrices along with a collection of high-level mathematical functions to execute these functions.

It relies on BLAS and LAPACK for efficient linear algebra computations. TensorFlow uses Numpy internally for performing multiple operations on Tensors.The two vital benefits that NumPy has to offer is the support for powerful N-dimensional array objects and built-in tools for performing intensive mathematical as well as scientific calculations. If you want to give this library a try, you can do so by adding it to your system with the command “pip install numpy”.

####Features:
The features of Numpy are enlisted below:

- Numpy makes complex mathematical implementations very simple owing to its easy syntax and wide range of in-built functions.
- Numpy uses an optimized C core for delivering high performance, interoperability with various computing platforms and hardware, and ease of use.
- It plays well with visualization libraries such as Matplotlib, Seaborn and Plotly.

####Applications:
- Numpy can be utilized for expressing images, sound waves, and other binary raw streams as an array of real numbers in N-dimensional. The real power of numpy lies in its support for n-dimensional arrays.
- Numpy library is frequently used in projects related to Data Science and Machine Learning.

###Matplotlib
![Matplotlib](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/a4u5i0r0jsr4l1oceith.png)

The Matplotlib library developed by John D. Hunter is one of the most popular visualization libraries for Python. Matplotlib is a comprehensive library for creating static, animated and interactive visualizations in Python by creating a wide variety of visualizations, including line plots, histograms, bar charts, pie charts, scatter plots, tables, and many other styles.Matplotlib is written in Python and makes use of NumPy, the numerical mathematics extension of Python. It provides an object-oriented API that helps in embedding plots in applications using Python GUI toolkits such as PyQt, WxPythonotTkinter. It can be used in Python and IPython shells, Jupyter notebook and web application servers also.

You can add Matplotlib to your development environment using the command, “pip install matplotlib”.

####Features:
The latest version of Matplotlib 3.3 supports some really exciting features, some of the latest highlighted feature are listed below:
- Offers a semantic way to generate complex, subplot grids.
- Colored Labels in legends.
- rcParams can be passed as Decorators.
- 3D plots now support minor ticks.

####Applications:

Matplotlib is majorly used to visualize the data using interactive graphs and plots. It is majorly used in Data Science and Machine learning to get insights on data.

###PyGame
![PyGame](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/mgp2p957nsvdi00ecqwf.png)
The Pygame library in Python developed by Pete Shinners is used to provide developer access to game development tools and libraries. It's the best and most popular game development library provided by Python and is cross-platform. It is built on top of SDL(Simple DirectMedia Layer) which provides low-level access to computer hardware like keyboard, mouse, and graphics hardware like the GPU via OpenGL and Direct3D.

If you want to give game development using PyGame a try, you can install the library easily using the command, “pip install pygame”.

####Features:
Pygame is a cross-platform library offering tons of useful features that aids in Fame development. Some of them are listed below:

- It is easy to use and fully modular.
- It offers a rich support for multi-core systems and is highly portable.
- Advanced gaming features like detecting collisions, vector math, pixel-array manipulation and much more.

####Applications:
The PyGame library of  Python is used to develop high-quality industry level games. Some of the popular PyGame projects include Flappy Bird, Snake Game, Sudoku Game, Retro Racing Game, Quabro.

###BeautifulSoup

![BeautifulSoup](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/qcd50xcqwcl0gwfbwgg1.png)
The BeautifulSoup library developed by Leonard Richardson is among the top libraries for web scraping and is used to scrape all or specified data from web pages.

The purpose of creating this library was to make information gathering from web pages a painless activity. It works with your favorite parser to provide idiomatic ways of navigating, searching, and modifying the parse tree. It commonly saves programmers hours or days of work.Installation of the library is straightforward, just run the command “pip install beautifulsoup4”, which downloads the latest v4 of the library that supports Python 3.

####Features:
Some of the features of the library are mentioned below:
- Information gathering from web pages using BeautifulSoup is very simple.
- It also allows handling various other aspects like navigation, modification of the parse tree and searching for the desired data.
- Beautiful Soup automatically converts incoming documents to Unicode and outgoing documents to UTF-8.

####Applications:
The BeautifulSoup library in Python is widely used in web scraping. Some of the applications are listed below:

- Effective method to extract data from websites.
- Scraped data using the bs4 library can be used in price comparison and competition monitoring in the E-commerce industry.
- It is also extensively used in tweets analysis, wherein all the tweets related to a particular hashtag needs to be

####Conclusion:

The “Python library” contains several different kinds of components. It contains data types that would normally be considered part of the “core” of a language, such as numbers and lists, The library also contains built-in functions and exceptions — objects that can be used by all Python code without the need of an import statement. 

Apart from the nine libraries explored above, there are plenty of other important and useful libraries as well, you will get to know them once you start making projects. Learning by doing is what an aspiring developer must do!!.

Happy Learning!!