DEV Community: Yash Makan

Most Exciting Python Features from 3.7 to 3.11

Yash Makan — Fri, 10 Mar 2023 06:49:19 +0000

Introduction

Hey innovators, I am Yash Makan and in today’s blog post we are going to discuss about some of the cool and helpful features that you won’t wanna miss, to add in your coding cookbooks. I’ll be mentioning 10 interesting features based on each latest python version that will make you a python guru. So without any more introduction, let’s dive in.

1. Adding Notes When Catching Exception

This feature of adding notes to python exceptions is added in the version 3.11. Now, developers can add more detailed information while handling exceptions to make it much more easier in the debugging stage. It can be utilized by adding add_note method to the Exception class.



try:

    raise TypeError

except Exception as e:

    e.add_notes("More Information regarding error")

    e.add_notes("Why not add some more info?")

----------------------------------------------------

Trackback (most recent call last):

    File "/main.py", 4, in <module>

        raise TypeError

TypeError

More Information regarding error

Why not add some more info?

Grouping Asynchronous Tasks

Do you know, from python 3.11, we can group asynchronous tasks together using the TaskGroup class. This class helps in running multiple coroutines and wait for all those coroutines to finish. This can be used in multiple scenarios where multiple coroutines are used. Let’s see an example to better understand.



import asyncio

async def coroutine_1():

    await asyncio.sleep(1)

    print("Coroutine 1")

async def coroutine_2():

    await asyncio.sleep(2)

    print("Coroutine 2")

async def main():

    async with asyncio.TaskGroup() as task_group:

        await task_group.create_task(coroutine_1())

        await task_group.create_task(coroutine_2())

        print("Both tasks are done now.")

asyncio.run(main())

----------------------------------------------------

Coroutine 1

Coroutine 2

Both tasks are done now.

square² and ∛cube root

Now python 3.11 has introduced a brand new update where developers can square or cube root any number.

…

I know what you guys are thinking but jokes aside, now we have inbuilt functions in the math module which helps us to do the exact same thing.



>>> import math

>>> math.exp2(4)

16.0

>>> math.cbrt(8)

2.0

Pattern Matching

Have you ever heard of switch case in other languages and always felt that python is missing out on this feature. If so, then worry no more. Python 3.10+, now developers can use match-case which is similar to switch case but is much more better. In the case, you can compare not only literals but also tuples, variables etc. Let’s see an example to better understand.



# point is an (x, y) tuple

match point:

    case (0, 0):

        print("Origin")

    case (0, y):

        print(f"x=0,y={y}")

    case (x, 0):

        print(f"x={x},y=0")

    case (x, y):

        print(f"x={x},y={y}")

    case _:

        raise ValueError("Not a point")

Union Alternative

You must have used Union from typing to tell compiler that the argument can either be int or float. Now from python 3.10, there’s a better way to do this. Instead of importing the Union class like from typing import Union You can use the same functionality with the | symbol.



from typing import Union

def square(number: Union[int, float]) -> Union[int, float]:

    return number ** 2

vs

def square(number: int | float) -> int | float:

    return number ** 2

Dictionary Merge Operator

From python 3.9, merging two dictionaries together is much easier because of the dict merge operator. Earlier, if we want to merge two dictionaries we can do that by dict3 = {**dict1, **dict2} but now we can use the | symbol to merge two dictionaries.



>>> dict1 = {"a": 1, "b": 2}

>>> dict2 = {"b": 3, "c": 4}

>>> {dict1, dict2}

{"a": 1, "b": 3, "c": 4}

>>> dict1 | dict2 # New way

{"a": 1, "b": 3, "c": 4}

Walrus Operator

The walrus operator allows developers, to assign and return value both at the same time. This feature was introduced in python 3.8. Let’s see an example to understand the := operator,



# Before Python 3.8

>>> numbers = [2, 8, 0, 1, 1, 9, 7, 7]

>>> num_length = len(numbers)

>>> num_sum = sum(numbers)

>>> description = {

...     "length": num_length,

...     "sum": num_sum,

...     "mean": num_sum / num_length,

... }

>>> description

{'length': 8, 'sum': 35, 'mean': 4.375}

# With Walrus Operator

>>> numbers = [2, 8, 0, 1, 1, 9, 7, 7]

>>> description = {

...     "length": (num_length := len(numbers)), # Here we are initializing and using both at the same time

...     "sum": (num_sum := sum(numbers)),

...     "mean": num_sum / num_length,

... }

>>> description

{'length': 8, 'sum': 35, 'mean': 4.375}

f-strings support `=` for self-documenting

In python 3.8, other interesting feature added is the f-string support for self documenting and debugging. Many of the times developers use print(f"check {variable}") to debug if the variable value is updated or not. Now, python 3.8 introduced a much better way to debug this exact same thing.



variable = get_data()

print(f"{variable=}") # variable='Hello World!'

Positional-only Parameters

In Python 3.8, positional-only parameter feature is added. Now, in a def function we can define which of our parameters can be positional only and keyword only parameters. This is done by separating the parameters by a / Let’s see an example,



def foo(a, b, /, **kwargs):

    print(a, b, kwargs)

>>> foo(10, 20, c=30, d=40, e=50) # correct as a and b must be a positional argument

10, 20, {'c': 30, 'd': 40,'e': 50}

Dataclasses

In Python 3.7, dataclasses are introduced. This feature will save you from writing ton of boilerplate code and makes your classes neat. This feature is one of may favorite as well. We can simply add the dataclass decorator to our class and it can generate most of the magic methods on it’s own such as __repr__() __eq__() and __hash__() Let’s see an example,



from dataclasses import dataclass

@dataclass

class Point:

    x: float

    y: float

    z: float = 0.0

p = Point(1.5, 2.5)

print(p)   # Point(x=1.5, y=2.5, z=0.0)

Conclusion

So in today’s article we have covered python’s most exciting features from Python 3.7 to 3.11 . Now Of course, there is a huge list of features that has been introduced which I haven’t mentioned, so let me know in the discussion below which of the features I have missed and that you love the most in python. I hope you liked my blog and if this article adds any value then make sure to spread it with your friends and don’t forget to bookmark. If you have any questions, let me know via Twitter or in the discussion below. If you’d like more content like this, I post on YouTube too. Till then b-bye!!

Localization Made Easy: Generate 100+ Languages with Single Click in Flutter

Yash Makan — Thu, 06 Oct 2022 20:36:21 +0000

Hey developers 👋 I have recently made a package in flutter which makes localization in flutter very easy. It can generate localization in 100+ languages with just a single command. It basically extracts strings from the project and uses google translate to achieve this. If interested you can check out the package on pub dev or I have made a detailed video as well.

YouTube: https://www.youtube.com/watch?v=FMbS-X65fpY
Package: https://pub.dev/packages/very_easy_localization
Github: https://github.com/YashMakan/very_easy_localization

If you have any doubts, suggestions then do let me know & it'll make my day if you can star the repo and subscribe to my channel. Hoping to see you on the other side... 😁

Instagram UI Design made in Flutter | Flutter UI Series P1

Yash Makan — Thu, 21 Jul 2022 10:33:19 +0000

Hey developers👋 I am Yash Makan and I welcome you to a brand new series where we are going to create different UI designs a week in Flutter. So basically, I am going to pick any UI design from the internet and the design can either be an image, Figma file or a PSD file. Also, in the series, we are just going to focus on the frontend and not the backend and will create designs for mobile as well as web. If you have any UI design requests for future parts in the series then make sure to drop them below that as well. In the first part, we are designing the UI of Instagram App. If you are interested then do check the video below,

Source code

Source Code is Available in the description box below in the video. So do check it out...

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Website: yashmakan.co.in

Twitter: @Yash_Makan

Whatsapp Clone for Android & IOS using Flutter & Python - Part 8 (Complete Tutorial)

Yash Makan — Thu, 21 Jul 2022 09:32:42 +0000

Hii developers 👋 if you are interested in developing a complete WhatsApp clone application in flutter then make sure to follow along with this series on YouTube. The 8th part is LIVE NOW where I have created the profile page UI for the personal view and the user view. Also updated the bottomsheet to send different types of messages. Do check it out!!
https://youtu.be/0doEUwRr2JQ
If you have any doubts, suggestions or requests for my upcoming videos then do let me know & it'll make my day if you can subscribe 😅. Hoping to see you on the other side...

Source code

Source Code is Available in the description box below in the video. So do check it out...

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Website: yashmakan.co.in

Twitter: @Yash_Makan

Whatsapp Clone for Android & IOS using Flutter & Python - Part 7 (Complete Tutorial)

Yash Makan — Sun, 03 Jul 2022 11:39:34 +0000

Hey fellas I am Yash Makan back with another article. Today we are going to continue our journey where you and I are going to create a complete whatsapp applicaion from scratch. Yup, from very start till the end. This is the part 7 of the series so If you have missed the previous parts then I will highly suggest you to check the playlist to understand better. If you don’t know about whatsapp application then basically it’s a social media messaging application where user can send messages to their friends & family. It also has features like video calling, status sharing and much more. And if you are thinking, are we going to develop all these features?? then the answer is yes my friend... Also If you are tired of reading and want me to get out of your mind then I’ve got a video covering all this just watch the youtube video below.

Source code

Source Code is Available in the description box below in the video. So do check it out...

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Website: yashmakan.co.in

Twitter: @Yash_Makan

Whatsapp Clone for Android & IOS using Flutter & Python - Part 6 (Complete Tutorial)

Yash Makan — Sun, 03 Jul 2022 11:30:50 +0000

Hey fellas I am Yash Makan back with another article. Today we are going to continue our journey where you and I are going to create a complete whatsapp applicaion from scratch. Yup, from very start till the end. This is the part 6 of the series so If you have missed the previous parts then I will highly suggest you to check the playlist to understand better. If you don’t know about whatsapp application then basically it’s a social media messaging application where user can send messages to their friends & family. It also has features like video calling, status sharing and much more. And if you are thinking, are we going to develop all these features?? then the answer is yes my friend... Also If you are tired of reading and want me to get out of your mind then I’ve got a video covering all this just watch the youtube video below.

Source code

Source Code is Available in the description box below in the video. So do check it out...

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Website: yashmakan.co.in

Twitter: @Yash_Makan

Face Recognition App In Flutter Using TensorflowLite & Google ML KIT

Yash Makan — Tue, 14 Jun 2022 07:23:26 +0000

Hey developers, I have created a face recognition authentication app in flutter using TensorFlowLite and Google ML KIT. If you are interested in the work and explanation then I've created a complete YouTube video mentioned below. Also, I've linked the GitHub repo in the description box so feel free to check it out well!

Source code

Source Code is Available in the description box below in the video. So do check it out...

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Website: yashmakan.co.in

Twitter: @Yash_Makan

Whatsapp Clone for Android & IOS using Flutter & Python - Part 5 (Complete Tutorial)

Yash Makan — Tue, 07 Jun 2022 10:32:01 +0000

Hey fellas I am Yash Makan back with another article. Today we are going to continue our journey where you and I are going to create a complete whatsapp applicaion from scratch. Yup, from very start till the end. This is the part 5 of the series so If you have missed the previous parts then I will highly suggest you to check the playlist to understand better. If you don’t know about whatsapp application then basically it’s a social media messaging application where user can send messages to their friends & family. It also has features like video calling, status sharing and much more. And if you are thinking, are we going to develop all these features?? then the answer is yes my friend... Also If you are tired of reading and want me to get out of your mind then I’ve got a video covering all this just watch the youtube video below.

Source code

Source Code is Available in the description box below in the video. So do check it out...

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Twitter: @Yash_Makan

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Building a Video Calling App using Python & Flask

Yash Makan — Sun, 29 May 2022 08:18:21 +0000

flask_webrtc_youtube

================

A basic WebRTC video audio chat app made using python Flask.

Create and join video chat rooms. The users connects to each other in a peer to peer mesh network using WebRTC. They share their audio and video directly with each other without going through a centralized server. However, a centralized server is needed to initiate the connections at first using a process called signaling. This, signaling server is made using Flask in python and data is shared between server and clients using SocketIO.

For demo & explaination visit: https://youtu.be/ZvG1-s7QmLs

Source code

Source Code is Available in the description box below in the video. So do check it out...

Installation

To run this on your machine, install the following:

Requirements:

python 3.x
Flask
Flask-SocketIO

Install requirements using pip:



pip install -r requirements.txt

To start a server on localhost:



python server.py

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Whatsapp Clone for Android & IOS using Flutter & Python - Part 3 (Complete Tutorial)

Yash Makan — Wed, 18 May 2022 17:57:35 +0000

Hey fellas I am Yash Makan back with another article. Today we are going to continue our journey where you and I are going to create a complete whatsapp applicaion from scratch. Yup, from very start till the end. This is the part 3 of the series so If you have missed the part 1 and part 2 yet then I will highly suggest you to check the playlist to understand better. If you don’t know about whatsapp application then basically it’s a social media messaging application where user can send messages to their friends & family. It also has features like video calling, status sharing and much more. And if you are thinking, are we going to develop all these features?? then the answer is yes my friend... Also If you are tired of reading and want me to get out of your mind then I’ve got a video covering all this just watch the youtube video below.

Source code

Source Code is Available in the description box below in the video. So do check it out...

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Website: yashmakan.co.in

Twitter: @Yash_Makan

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buymeacoffee: @Here

How to Run Python Code in Your Flutter App with pyFlut

Yash Makan — Tue, 10 May 2022 19:03:33 +0000

Hey developers 👋 for the past month, I've been working on a package in which we can write python code inside flutter applications. Currently, it supports pure python packages. This opens new possibilities as now we can use already written modules of python in flutter apps. Later I am also going to add support for libraries with c components like NumPy, TensorFlow, matplotlib etc. You can check the demo in this youtube video and if you are interested then make sure to subscribe to my youtube channel so that you'll get all the updates regarding this package. b-bye!!

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Whatsapp Clone for Android & IOS using Flutter & Python - Part 2 (Complete Tutorial)

Yash Makan — Wed, 04 May 2022 09:44:31 +0000

Hey fellas I am Yash Makan back with another article. Today we are going to continue our journey where you and I are going to create a complete whatsapp applicaion from scratch. Yup, from very start till the end. This is the part 2 of the series so If you have missed the part 1 then I will highly suggest you to check the playlist to understand better. If you don’t know about whatsapp application then basically it’s a social media messaging application where user can send messages to their friends & family. It also has features like video calling, status sharing and much more. And if you are thinking, are we going to develop all these features?? then the answer is yes my friend... Also If you are tired of reading and want me to get out of your mind then I’ve got a video covering all this just watch the youtube video below.

Source code

Source Code is Available in the description box below in the video. So do check it out...

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Website: yashmakan.co.in

Twitter: @Yash_Makan

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buymeacoffee: @Here

DEV Community: Yash Makan

Most Exciting Python Features from 3.7 to 3.11

Introduction

1. Adding Notes When Catching Exception

Grouping Asynchronous Tasks

square² and ∛cube root

Pattern Matching

Union Alternative

Dictionary Merge Operator

Walrus Operator

f-strings support = for self-documenting

Positional-only Parameters

Dataclasses

Conclusion

Localization Made Easy: Generate 100+ Languages with Single Click in Flutter

Instagram UI Design made in Flutter | Flutter UI Series P1

Source code

Subscribe For More

Contact Me

Other Interesting Articles

Whatsapp Clone for Android & IOS using Flutter & Python - Part 8 (Complete Tutorial)

Source code

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Contact Me

Other Interesting Articles

Whatsapp Clone for Android & IOS using Flutter & Python - Part 7 (Complete Tutorial)

Source code

Subscribe For More

Contact Me

Other Interesting Articles

Whatsapp Clone for Android & IOS using Flutter & Python - Part 6 (Complete Tutorial)

Source code

Subscribe For More

Contact Me

Other Interesting Articles

Face Recognition App In Flutter Using TensorflowLite & Google ML KIT

Source code

Subscribe For More

Contact Me

Other Interesting Articles

Whatsapp Clone for Android & IOS using Flutter & Python - Part 5 (Complete Tutorial)

Source code

Subscribe For More

Contact Me

Contribute

Other Interesting Articles

Building a Video Calling App using Python & Flask

flask_webrtc_youtube

Source code

Installation

Requirements:

Subscribe For More

Contact Me

Contribute

Other Interesting Articles

Whatsapp Clone for Android & IOS using Flutter & Python - Part 3 (Complete Tutorial)

Source code

Subscribe For More

Contact Me

Contribute

Other Interesting Articles

How to Run Python Code in Your Flutter App with pyFlut

Subscribe For More

Contact Me

Contribute

Other Interesting Articles

Whatsapp Clone for Android & IOS using Flutter & Python - Part 2 (Complete Tutorial)

Source code

Subscribe For More

Contact Me

Contribute

Other Interesting Articles

f-strings support `=` for self-documenting