Skip to main content

What's New in Python 3.8, 3.7 and 3.6?

What Is Python?
Python is an Interpreted, Interactive, Object-Oriented, and high level programming language and it has design philosophy that emphasizes code readability.

Python is created by Guido van Rossum and the first released in 20 February 1991; around 26 years ago.

What's New in Python 3.8, 3.7 and 3.6?
Currently, Python 3.8 is in development phase. You can see, much of added and updated features, functionality to the newly released Python 3.7 and 3.8.

1) Coroutines with async and await syntax
Async def syntax -
>>> async def coro():
...     return 'spam'

Example -
import asyncio

async def coro(name, lock):
    print('Coroutine {}: waiting for lock'.format(name))
    async with lock:
        print('Coroutine {}: holding the lock'.format(name))
        await asyncio.sleep(1)
        print('Coroutine {}: releasing the lock'.format(name))

loop = asyncio.get_event_loop()
lock = asyncio.Lock()
coros = asyncio.gather(coro(1, lock), coro(2, lock))

The Output looks like -
Coroutine 2: waiting for lock
Coroutine 2: holding the lock
Coroutine 1: waiting for lock
Coroutine 2: releasing the lock
Coroutine 1: holding the lock
Coroutine 1: releasing the lock

2) A dedicated infix operator for matrix multiplication - a new matrix multiplication operator: a @ b

Previously code looks like -
S = dot((dot(H, beta) - r).T, dot(inv(dot(dot(H, V), H.T)), dot(H, beta) - r))

Now, shorter sweeter and its looks like -
S = (H @ beta - r).T @ inv(H @ V @ H.T) @ (H @ beta - r)

3) Added new library modules - Type Hints
For example, a simple greeting function -
def greeting(name: str) -> str:
    return 'Hello ' + name

4) Adding a file system path protocol
5) Formatted string literals
6) Added New bytes.hex (), bytearray.hex () and memoryview.hex () methods
7) Security improvements - SSLv3 is now disabled throughout the standard library. It can still be enabled by instantiating ssl.SSLContext manually.
8) Percept formatting support for bytes and bytearray - adds support for the % interpolation operator to bytes and bytearray.
9) The os.scandir () function is a faster directory iterator.
10) Added Retry system calls failing with EINTR - An errno.EINTR error code are returned whenever a system call that is waiting for I/O is interrupted by a signal. Previously, Python would raise Interrupted Error in such cases. This meant that, when writing a Python application, the developer had two choices-
    -  Ignore the InterruptedError
    -  Handle the InterruptedError and attempt to restart the interrupted system call at every call site
11) Added New Modules - secrets, typing and zipapp.
12) Advanced unpacking -

Previously, you can do this
>>> a, b = range(2)
>>> a
>>> b

Now you can do this -
>>> a, b, *rest = range(10)
>>> a
>>> b
>>> rest
[2, 3, 4, 5, 6, 7, 8, 9]

13) For 3.8 - Syntax for variable annotations
For example,
primes: List[int] = []

captain: str  # Note: no initial value!

class Starship:
    stats: Dict[str, int] = {}

14) Underscores in Numeric Literals - adds the ability to use underscores in numeric literals for improved readability.
15) Simpler customization of class creation -

class PluginBase:
    subclasses = []

    def __init_subclass__(cls, **kwargs):

class Plugin1(PluginBase):

class Plugin2(PluginBase):

16) Descriptor Protocol Enhancements
17) Adding a file system path protocol
18) Local Time Disambiguation
19) PYTHONMALLOC environment variable -Newly allocated memory is filled with the byte 0xCB. Now It is possible to install debug hooks on Python memory allocators on Python compiled in release mode using PYTHONMALLOC=debug
By Anil Singh | Rating of this article (*****)

Popular posts from this blog

List of Countries, Nationalities and their Code In Excel File

Download JSON file for this List - Click on JSON file    Countries List, Nationalities and Code Excel ID Country Country Code Nationality Person 1 UNITED KINGDOM GB British a Briton 2 ARGENTINA AR Argentinian an Argentinian 3 AUSTRALIA AU Australian an Australian 4 BAHAMAS BS Bahamian a Bahamian 5 BELGIUM BE Belgian a Belgian 6 BRAZIL BR Brazilian a Brazilian 7 CANADA CA Canadian a Canadian 8 CHINA CN Chinese a Chinese 9 COLOMBIA CO Colombian a Colombian 10 CUBA CU Cuban a Cuban 11 DOMINICAN REPUBLIC DO Dominican a Dominican 12 ECUADOR EC Ecuadorean an Ecuadorean 13 EL SALVADOR

39 Best Object Oriented JavaScript Interview Questions and Answers

Most Popular 37 Key Questions for JavaScript Interviews. What is Object in JavaScript? What is the Prototype object in JavaScript and how it is used? What is "this"? What is its value? Explain why "self" is needed instead of "this". What is a Closure and why are they so useful to us? Explain how to write class methods vs. instance methods. Can you explain the difference between == and ===? Can you explain the difference between call and apply? Explain why Asynchronous code is important in JavaScript? Can you please tell me a story about JavaScript performance problems? Tell me your JavaScript Naming Convention? How do you define a class and its constructor? What is Hoisted in JavaScript? What is function overloadin

React | Encryption and Decryption Data/Text using CryptoJs

To encrypt and decrypt data, simply use encrypt () and decrypt () function from an instance of crypto-js. Node.js (Install) Requirements: 1.       Node.js 2.       npm (Node.js package manager) 3.       npm install crypto-js npm   install   crypto - js Usage - Step 1 - Import var   CryptoJS  =  require ( "crypto-js" ); Step 2 - Encrypt    // Encrypt    var   ciphertext  =  CryptoJS . AES . encrypt ( JSON . stringify ( data ),  'my-secret-key@123' ). toString (); Step 3 -Decrypt    // Decrypt    var   bytes  =  CryptoJS . AES . decrypt ( ciphertext ,  'my-secret-key@123' );    var   decryptedData  =  JSON . parse ( bytes . toString ( CryptoJS . enc . Utf8 )); As an Example,   import   React   from   'react' ; import   './App.css' ; //Including all libraries, for access to extra methods. var   CryptoJS  =  require ( "crypto-js" ); function   App () {    var   data

25 Best Vue.js 2 Interview Questions and Answers

What Is Vue.js? The Vue.js is a progressive JavaScript framework and used to building the interactive user interfaces and also it’s focused on the view layer only (front end). The Vue.js is easy to integrate with other libraries and others existing projects. Vue.js is very popular for Single Page Applications developments. The Vue.js is lighter, smaller in size and so faster. It also supports the MVVM ( Model-View-ViewModel ) pattern. The Vue.js is supporting to multiple Components and libraries like - ü   Tables and data grids ü   Notifications ü   Loader ü   Calendar ü   Display time, date and age ü   Progress Bar ü   Tooltip ü   Overlay ü   Icons ü   Menu ü   Charts ü   Map ü   Pdf viewer ü   And so on The Vue.js was developed by “ Evan You ”, an Ex Google software engineer. The latest version is Vue.js 2. The Vue.js 2 is very similar to Angular because Evan You was inspired by Angular and the Vue.js 2 components looks like -

Encryption and Decryption Data/Password in Angular

You can use crypto.js to encrypt data. We have used 'crypto-js'.   Follow the below steps, Steps 1 –  Install CryptoJS using below NPM commands in your project directory npm install crypto-js --save npm install @types/crypto-js –save After installing both above commands it looks like  – NPM Command  1 ->   npm install crypto-js --save NPM Command  2 ->   npm install @types/crypto-js --save Steps 2  - Add the script path in “ angular.json ” file. "scripts" : [                "../node_modules/crypto-js/crypto-js.js"               ] Steps 3 –  Create a service class “ EncrDecrService ” for  encrypts and decrypts get/set methods . Import “ CryptoJS ” in the service for using  encrypt and decrypt get/set methods . import  {  Injectable  }  from   '@angular/core' ; import   *   as   CryptoJS   from   'crypto-js' ; @ Injectable ({    providedIn:   'root' }) export   class   EncrDecrS