Javascript Reaction Tutorial

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Over the past few years, React.js has emerged as a popular framework used to develop effective web applications. If you’ve spent any time working with JavaScript, chances are you’ve heard the word React at some point.

React.js, developed by Facebook, is a JavaScript library for building user interfaces. React makes it easy for developers to create and aesthetically pleasing interactive user experience for websites.

According to Stack Goal developer survey 2019 , React.js is the most beloved web framework among developers. React is so popular that sites like Facebook, Codecademy, and New York Times are all built using the React framework.

This Guide discussing the best way to learn programming using React online. We are going to pass what you need to know to start your React learning journey .

What is JavaScript?

Before discussing it in React, we need to talk about two concepts: front-end development and JavaScript

There are two main components of ’a website: front-end and back-end. The front-end is what the user sees on a site. The back- end is what the users do not see, such as scripting forms in e process on a site.

The backend and the frontend code come together to create a website. Along with HTML and CSS, JavaScript is a foundational technology used for front-end web development and allows you to create dynamic web content.

What is React?

React.js is an open source JavaScript library. It is used to create user interfaces and components for a web page. Facebook and the open source community maintain React.js

You can group parts of a website into components with React, which are small blocks of construction for your application. Questo approccio alla codifica basato su componenti ti consente di ridurre la ripetizione nel tuo codice e migliorare la velocità di un’applicazione web.

La libreria React √® forse la libreria JavaScript pi√π popolare al mondo grazie alla sua semplicità d ’Use. React is businesses ranging from Facebook to Netflix and Slack.

React uses JSX (which is short for JavaScript Extension) which makes it easy to write an efficient web using HTML like syntax. In the second place , React offers a feature called virtual DOM, which, without going into too much detail, accelerates sites loading.

Do you need to study React?

Learning to code in React.js is a great investment of your time for any budding front-end web developer . But why is it so? First of all, a wide variety of large organizations use React, from the New York Times to Facebook. If you know how to code in React, you will have a great skill that you can list on your resume.

Second , React it makes it easy to develop modern web applications. React offers features like declarative syntax and a wide range of external libraries that allow you to build powerful web experiences.

React has become more popular, an increasing number of raw resources have emerged . This should make it easier for you to get started.

React is used for front-end web development. This is the side of web development that is building the part of a website that the user sees.

Backend Development, on the other hand, is the "brain" behind a website.

React allows developers to create reusable components for the front. This brings more structure to a front-end website writing process and helps reduce code duplication.

How long to take to learn ReactJS?

In short, becoming proficient with the basics of React will take one to six months. The exact time to master React depends on your software development experience and how much time you are willing to devote to learning.

If you spend 10 hours per week learning React, you will learn to use the library much faster than you would if you spent less time learning. If you spend two hours learning React Day, you should be able to master the fundamentals within a few months.

These time frames do not take into account the time it takes to learn you would react if you didn’t have experience programs. Since React is a JavaScript framework, the first thing you need to do is master the fundamentals of JavaScript. Then you’ll be ready to start some research on how to program using React.

is React hard to learn?

If you find it hard not to learn the basics of React as long as you are familiar with coding in HTML, CSS, and JavaScript.

While React has its own unique ecosystem and development practices, you don’t need to be an expert programmer to get started. Your knowledge of general web development practices will take you a long way.

The more familiar you are with web development, the easier it will be for you to learn React. It helps if you have experience using another framework, such as Angular. This is because you will have a better understanding of how frames relate to the broader JavaScript language.

Learn to react quickly

Are you convinced that learning to react is a good use of your time? Great! There is one question to answer: How can you learn to react quickly

First , we will discuss the main skills you need to know when it comes to reacting. Next, we’re going to talk about how you can actually learn these skills

Develop your skills

Learning to program using React.js is a little different from learning to ’ linguistic programming. This is because unlike technologies such as CSS or HTML, React is a library that is part of another programming language:. JavaScript

To help you on your journey, we’ve compiled a list of the best skills you have. I’ll have to build.

Learn HTML, CSS, and JavaScript

Before you can program using React, you need to learn HTML, CSS and JavaScript.

Although HTML and CSS are not required, the JSX syntax used by React is based on HTML. You will need to have a good knowledge of HTML to understand how it works. When it comes to JavaScript, React is based on JavaScript, so there’s no way to learn JavaScript programming.

You need to know the basics of JavaScript and have a good understanding of HTML and CSS to get started with React. Your best bet is to focus on learning JavaScript ES6 or later. This will give you a good foundation on which to build your JavaScript skills. This should be in addition to learning the basics of HTML and CSS

Here are some resources you can use to learn about the basics of HTML, CSS, and JavaScript.

JSX

JSX or JavaScript expression, is a ’syntax extension for JavaScript written for use with React. The JSX technology allows you to describe what a user interface should look like a website. You should start learning React by exploring how JSX works. Find out how you can use JSX to create elements in a user interface.

Here are some topics you should explore to deepen your understanding of JSX:.

routing

Routing, in layman’s terms, shows how users access your website. It is a tool that links URLs and your application. Consider this example. You are on your home page and you have clicked and gone to your bio page. This is routing in action.

React Router allows creating a single page web application without refreshing the page the user is currently browsing . The router uses a structure constituting call components, which contains and displays the appropriate information.

Components

Components are the building blocks on which all JS React based applications are built. All web pages using React components use to declare each part of the site. For example, a navigation bar can be a component or an article on a web page can be a component. In turn, the article c component could consist of a comment component or a text component.

Components allow you to develop user interfaces that are easier to maintain and load quickly. Here are the main topics you should master when it comes to reacting components:

rendering lists

Lists are an important part of any site Web. Building a list in React is a great way to familiarize yourself with the basics of coding in React. As you get to know React, you should take the time to learn how to display lists of data on a web page.

State and prop management

State refers to how each object appears on a web page. Each component in a React application can have its own state, which is part of an object called ce.

Props, on the other hand, are used for sharing code between components. To work with React, you need to have a good understanding of both states and props. Here are the main topics you need to know:

Redux

Redux is a JavaScript library that makes it easy to manage the "state‚" of your application. Think about state in terms of what you’ve learned about components at this point.

The state of a component is like props that are passed to a component, like a simple JavaScript object. This object contains information that affects how a component is rendered.

Is -what ? this confused you a different way of looking Redux is that it helps you . manage data and see how you react to user actions Redux makes easier the management of the State; however, there a bit of a learning curve when starting up.

Next steps

We’ve only scratched the surface of React for JS concepts. Because the library is so popular, frequent updates are available. These updates continue to add even more features to make using React a more enjoyable experience.

The topics we covered above will give you an idea of ‚Äã‚ÄãReact’s basic capabilities. Once you have mastered these topics, you can continue to explore more advanced concepts of the React ecosystem:

, there is a lot you can learn once you master the basics! When you know the basics, these arguments come naturally to you. They are all based on the same fundamental principles used to create REACT library.

The best way to learn React for free

React has a large community of developers that support the library. This means that there is no shortage of resources out there that you can use to learn React. While this is a good thing, it also has ways that it can be difficult to find resources that are worth your time

Before you start learning React, ask yourself. How can you learn best? Is - what you like tutorials? Or do you prefer online videos ? Is - what you like working on interactive projects, or do you work with the theory, then build your own projects? . By answering this question ahead of time, you will be able to narrow your focus as you seek educational materials

To help you get started, here are some places you can learn React:

React online resources

Check out the React documentation

the official React documentation is the one of the best sources of content for learning React. The documentation is React updated with every change to the library. This means that everything you read on the site should reflect the latest version of React.

The React documentation was written by the React core team and a community of passionate React developers. It is considered to be a source of high quality content .

Since the documentation was written by the React team, there are n’t any business interests you need to worry about. The documentation was written purely to help people better understand React. You can find the React documentation maintainer . << / P> h4 id = "h-reaction-resources"> resources to react < / a>

REACT resources is a directory of resources for people who work with React. You’ll find plenty of guides to help you along the way, broken down into categories like podcasts, books, and lectures.

Introduction to React

This freeCodeCamp guide covers the basics of React. You will learn how to create a small project that retrieves data from an API by following this guide.

Other resources

Aside from the official introduction to React tutorial, there are a lot of great guides and tutorials that you can use to learn React. The use of tutorials to teach React is a great way to hone your skills because authors generally treat their reflection step by step.

This means that you can easily follow what is being discussed. . If needed, you can always come back to an earlier point in the tutorial if you get stuck

Here are some of the best tutorials and guides available for React:

react online course

Another way to learn is React by taking online courses . Online courses are like a class you would take in college. But you can control the pace at which you walk the course. And you can always rewind a video if you get stuck.

React Starter Kit

React Starter Kit is a five part course without any presents you react. This course is accompanied by code snippets that illustrate the concepts covered in the course.

Codecademy: 101 React

Codecademy has an online course on React development. You will learn JSX, lifecycle methods, hooks, and everything you need to know to build a web application using React.

Scrimba: learn to react for free

Learn to react is a free online course with 48 video tutorials. You will cover topics like ReactDOM and conditional rendering in depth.

If you’re looking for more courses, check out the official List of Community React courses .

React tutorials

There are a good number of tutorials online that React Satisfy Any grass React developer. In addition to the React programming courses and challenges to help you practice, tutorials usually hone your React development skills with step-by-step instructions or processes. If you want better at front-end development, learning basic React concepts by whatever means available might give you an advantage

! "PLUS: What is a database schema? Even advanced learners are in luck as there are a lot of YouTube channels and websites offering React know-how on more difficult topics. Some of these tutorials use popular websites or mobile apps to teach these concepts by breaking the elements down. In other cases, you may need to build your application at the same time as the developer in the tutorial to practice your skills in real time.

Most of these tutorials are available for free on the web, so they cannot wait for a certificate of completion from one of them. However, seasoned professionals and software developers lead these tutorials. You will also have the chance to work on concrete projects as part of the learning process

Best React Tutorial for Beginners

React JS - React Tutorial for beginners

Learn the basics of React JS through this two and a half hour tutorial by Mosh Hamedani. Part 1 introduces you to React and how to set up a development environment, which you’ll need to make sure there are no interruptions while you are working on your project.

The tutorial focuses on basic concepts such as expressions, attributes, classes, and lists. You’ll also learn how to debug React apps when you run into issues, which will boost your troubleshooting skills.

Learn React JS - Complete Beginner’s Course - Tutorial 2019

This in-depth, five-hour React tutorial by freeCodeCamp begins with an introduction to React and the philosophy behind it. As you learn more about key concepts in React JS, the tutorial expects you to build your own dynamic web application. There is an in-depth discussion of how to design your React application with CSS classes and how to generate or exchange ideas across multiple designs and ideas to put your skills into practice.

React crash course for beginners 2021 - Learn ReactJS from scratch in this 100% free tutorial!

Maximilian Schwarzmüller offers a crash course for beginners that focuses on building an application with React JS. The tutorial emphasizes the importance of the components, as they will determine the appearance of the application on the screen.

If you are a future end development leader, you will gain a basic understanding of styling using CSS classes through this tutorial. For example, you will learn how to prepare your application for the web and finally deploy it for use.

React tutorial for beginners

If you’re looking for a shorter tutorial, this 43 minute beginner video covers the basics of building an app through React JS. The tutorial begins with instructions on installing React, then provides an in-depth discussion of the components, and focuses primarily on writing code with the React hook. It also teaches you how to switch accessories, which is essential when sending data from one component to another and necessary for the optimal functioning of any application.

React JS beginners course - Tutorial 2021

Another tutorial from freeCodeCamp, this video is available for free and is over seven hours long. This tutorial is ideal if you want to have a good understanding of React and full stack web development.

The tutorial

Javascript Reaction Tutorial cos: Questions

cos

How do I install pip on macOS or OS X?

5 answers

I spent most of the day yesterday searching for a clear answer for installing pip (package manager for Python). I can"t find a good solution.

How do I install it?

1672

Answer #1

UPDATE (Jan 2019):

easy_install has been deprecated. Please use get-pip.py instead.


Old answer:

easy_install pip

If you need admin privileges to run this, try:

sudo easy_install pip

1672

Answer #2

⚡️ TL;DR — One line solution.

All you have to do is:

sudo easy_install pip

2019: ⚠️easy_install has been deprecated. Check Method #2 below for preferred installation!

Details:

⚡️ OK, I read the solutions given above, but here"s an EASY solution to install pip.

MacOS comes with Python installed. But to make sure that you have Python installed open the terminal and run the following command.

python --version

If this command returns a version number that means Python exists. Which also means that you already have access to easy_install considering you are using macOS/OSX.

ℹ️ Now, all you have to do is run the following command.

sudo easy_install pip

After that, pip will be installed and you"ll be able to use it for installing other packages.

Let me know if you have any problems installing pip this way.

Cheers!

P.S. I ended up blogging a post about it. QuickTip: How Do I Install pip on macOS or OS X?


✅ UPDATE (Jan 2019): METHOD #2: Two line solution —

easy_install has been deprecated. Please use get-pip.py instead.

First of all download the get-pip file

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py

Now run this file to install pip

python get-pip.py

That should do it.

Another gif you said? Here ya go!

1672

Answer #3

You can install it through Homebrew on OS X. Why would you install Python with Homebrew?

The version of Python that ships with OS X is great for learning but it’s not good for development. The version shipped with OS X may be out of date from the official current Python release, which is considered the stable production version. (source)

Homebrew is something of a package manager for OS X. Find more details on the Homebrew page. Once Homebrew is installed, run the following to install the latest Python, Pip & Setuptools:

brew install python

Javascript Reaction Tutorial exp: Questions

exp

How do I merge two dictionaries in a single expression (taking union of dictionaries)?

5 answers

Carl Meyer By Carl Meyer

I have two Python dictionaries, and I want to write a single expression that returns these two dictionaries, merged (i.e. taking the union). The update() method would be what I need, if it returned its result instead of modifying a dictionary in-place.

>>> x = {"a": 1, "b": 2}
>>> y = {"b": 10, "c": 11}
>>> z = x.update(y)
>>> print(z)
None
>>> x
{"a": 1, "b": 10, "c": 11}

How can I get that final merged dictionary in z, not x?

(To be extra-clear, the last-one-wins conflict-handling of dict.update() is what I"m looking for as well.)

5839

Answer #1

How can I merge two Python dictionaries in a single expression?

For dictionaries x and y, z becomes a shallowly-merged dictionary with values from y replacing those from x.

  • In Python 3.9.0 or greater (released 17 October 2020): PEP-584, discussed here, was implemented and provides the simplest method:

    z = x | y          # NOTE: 3.9+ ONLY
    
  • In Python 3.5 or greater:

    z = {**x, **y}
    
  • In Python 2, (or 3.4 or lower) write a function:

    def merge_two_dicts(x, y):
        z = x.copy()   # start with keys and values of x
        z.update(y)    # modifies z with keys and values of y
        return z
    

    and now:

    z = merge_two_dicts(x, y)
    

Explanation

Say you have two dictionaries and you want to merge them into a new dictionary without altering the original dictionaries:

x = {"a": 1, "b": 2}
y = {"b": 3, "c": 4}

The desired result is to get a new dictionary (z) with the values merged, and the second dictionary"s values overwriting those from the first.

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

A new syntax for this, proposed in PEP 448 and available as of Python 3.5, is

z = {**x, **y}

And it is indeed a single expression.

Note that we can merge in with literal notation as well:

z = {**x, "foo": 1, "bar": 2, **y}

and now:

>>> z
{"a": 1, "b": 3, "foo": 1, "bar": 2, "c": 4}

It is now showing as implemented in the release schedule for 3.5, PEP 478, and it has now made its way into the What"s New in Python 3.5 document.

However, since many organizations are still on Python 2, you may wish to do this in a backward-compatible way. The classically Pythonic way, available in Python 2 and Python 3.0-3.4, is to do this as a two-step process:

z = x.copy()
z.update(y) # which returns None since it mutates z

In both approaches, y will come second and its values will replace x"s values, thus b will point to 3 in our final result.

Not yet on Python 3.5, but want a single expression

If you are not yet on Python 3.5 or need to write backward-compatible code, and you want this in a single expression, the most performant while the correct approach is to put it in a function:

def merge_two_dicts(x, y):
    """Given two dictionaries, merge them into a new dict as a shallow copy."""
    z = x.copy()
    z.update(y)
    return z

and then you have a single expression:

z = merge_two_dicts(x, y)

You can also make a function to merge an arbitrary number of dictionaries, from zero to a very large number:

def merge_dicts(*dict_args):
    """
    Given any number of dictionaries, shallow copy and merge into a new dict,
    precedence goes to key-value pairs in latter dictionaries.
    """
    result = {}
    for dictionary in dict_args:
        result.update(dictionary)
    return result

This function will work in Python 2 and 3 for all dictionaries. e.g. given dictionaries a to g:

z = merge_dicts(a, b, c, d, e, f, g) 

and key-value pairs in g will take precedence over dictionaries a to f, and so on.

Critiques of Other Answers

Don"t use what you see in the formerly accepted answer:

z = dict(x.items() + y.items())

In Python 2, you create two lists in memory for each dict, create a third list in memory with length equal to the length of the first two put together, and then discard all three lists to create the dict. In Python 3, this will fail because you"re adding two dict_items objects together, not two lists -

>>> c = dict(a.items() + b.items())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for +: "dict_items" and "dict_items"

and you would have to explicitly create them as lists, e.g. z = dict(list(x.items()) + list(y.items())). This is a waste of resources and computation power.

Similarly, taking the union of items() in Python 3 (viewitems() in Python 2.7) will also fail when values are unhashable objects (like lists, for example). Even if your values are hashable, since sets are semantically unordered, the behavior is undefined in regards to precedence. So don"t do this:

>>> c = dict(a.items() | b.items())

This example demonstrates what happens when values are unhashable:

>>> x = {"a": []}
>>> y = {"b": []}
>>> dict(x.items() | y.items())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unhashable type: "list"

Here"s an example where y should have precedence, but instead the value from x is retained due to the arbitrary order of sets:

>>> x = {"a": 2}
>>> y = {"a": 1}
>>> dict(x.items() | y.items())
{"a": 2}

Another hack you should not use:

z = dict(x, **y)

This uses the dict constructor and is very fast and memory-efficient (even slightly more so than our two-step process) but unless you know precisely what is happening here (that is, the second dict is being passed as keyword arguments to the dict constructor), it"s difficult to read, it"s not the intended usage, and so it is not Pythonic.

Here"s an example of the usage being remediated in django.

Dictionaries are intended to take hashable keys (e.g. frozensets or tuples), but this method fails in Python 3 when keys are not strings.

>>> c = dict(a, **b)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: keyword arguments must be strings

From the mailing list, Guido van Rossum, the creator of the language, wrote:

I am fine with declaring dict({}, **{1:3}) illegal, since after all it is abuse of the ** mechanism.

and

Apparently dict(x, **y) is going around as "cool hack" for "call x.update(y) and return x". Personally, I find it more despicable than cool.

It is my understanding (as well as the understanding of the creator of the language) that the intended usage for dict(**y) is for creating dictionaries for readability purposes, e.g.:

dict(a=1, b=10, c=11)

instead of

{"a": 1, "b": 10, "c": 11}

Response to comments

Despite what Guido says, dict(x, **y) is in line with the dict specification, which btw. works for both Python 2 and 3. The fact that this only works for string keys is a direct consequence of how keyword parameters work and not a short-coming of dict. Nor is using the ** operator in this place an abuse of the mechanism, in fact, ** was designed precisely to pass dictionaries as keywords.

Again, it doesn"t work for 3 when keys are not strings. The implicit calling contract is that namespaces take ordinary dictionaries, while users must only pass keyword arguments that are strings. All other callables enforced it. dict broke this consistency in Python 2:

>>> foo(**{("a", "b"): None})
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: foo() keywords must be strings
>>> dict(**{("a", "b"): None})
{("a", "b"): None}

This inconsistency was bad given other implementations of Python (PyPy, Jython, IronPython). Thus it was fixed in Python 3, as this usage could be a breaking change.

I submit to you that it is malicious incompetence to intentionally write code that only works in one version of a language or that only works given certain arbitrary constraints.

More comments:

dict(x.items() + y.items()) is still the most readable solution for Python 2. Readability counts.

My response: merge_two_dicts(x, y) actually seems much clearer to me, if we"re actually concerned about readability. And it is not forward compatible, as Python 2 is increasingly deprecated.

{**x, **y} does not seem to handle nested dictionaries. the contents of nested keys are simply overwritten, not merged [...] I ended up being burnt by these answers that do not merge recursively and I was surprised no one mentioned it. In my interpretation of the word "merging" these answers describe "updating one dict with another", and not merging.

Yes. I must refer you back to the question, which is asking for a shallow merge of two dictionaries, with the first"s values being overwritten by the second"s - in a single expression.

Assuming two dictionaries of dictionaries, one might recursively merge them in a single function, but you should be careful not to modify the dictionaries from either source, and the surest way to avoid that is to make a copy when assigning values. As keys must be hashable and are usually therefore immutable, it is pointless to copy them:

from copy import deepcopy

def dict_of_dicts_merge(x, y):
    z = {}
    overlapping_keys = x.keys() & y.keys()
    for key in overlapping_keys:
        z[key] = dict_of_dicts_merge(x[key], y[key])
    for key in x.keys() - overlapping_keys:
        z[key] = deepcopy(x[key])
    for key in y.keys() - overlapping_keys:
        z[key] = deepcopy(y[key])
    return z

Usage:

>>> x = {"a":{1:{}}, "b": {2:{}}}
>>> y = {"b":{10:{}}, "c": {11:{}}}
>>> dict_of_dicts_merge(x, y)
{"b": {2: {}, 10: {}}, "a": {1: {}}, "c": {11: {}}}

Coming up with contingencies for other value types is far beyond the scope of this question, so I will point you at my answer to the canonical question on a "Dictionaries of dictionaries merge".

Less Performant But Correct Ad-hocs

These approaches are less performant, but they will provide correct behavior. They will be much less performant than copy and update or the new unpacking because they iterate through each key-value pair at a higher level of abstraction, but they do respect the order of precedence (latter dictionaries have precedence)

You can also chain the dictionaries manually inside a dict comprehension:

{k: v for d in dicts for k, v in d.items()} # iteritems in Python 2.7

or in Python 2.6 (and perhaps as early as 2.4 when generator expressions were introduced):

dict((k, v) for d in dicts for k, v in d.items()) # iteritems in Python 2

itertools.chain will chain the iterators over the key-value pairs in the correct order:

from itertools import chain
z = dict(chain(x.items(), y.items())) # iteritems in Python 2

Performance Analysis

I"m only going to do the performance analysis of the usages known to behave correctly. (Self-contained so you can copy and paste yourself.)

from timeit import repeat
from itertools import chain

x = dict.fromkeys("abcdefg")
y = dict.fromkeys("efghijk")

def merge_two_dicts(x, y):
    z = x.copy()
    z.update(y)
    return z

min(repeat(lambda: {**x, **y}))
min(repeat(lambda: merge_two_dicts(x, y)))
min(repeat(lambda: {k: v for d in (x, y) for k, v in d.items()}))
min(repeat(lambda: dict(chain(x.items(), y.items()))))
min(repeat(lambda: dict(item for d in (x, y) for item in d.items())))

In Python 3.8.1, NixOS:

>>> min(repeat(lambda: {**x, **y}))
1.0804965235292912
>>> min(repeat(lambda: merge_two_dicts(x, y)))
1.636518670246005
>>> min(repeat(lambda: {k: v for d in (x, y) for k, v in d.items()}))
3.1779992282390594
>>> min(repeat(lambda: dict(chain(x.items(), y.items()))))
2.740647904574871
>>> min(repeat(lambda: dict(item for d in (x, y) for item in d.items())))
4.266070580109954
$ uname -a
Linux nixos 4.19.113 #1-NixOS SMP Wed Mar 25 07:06:15 UTC 2020 x86_64 GNU/Linux

Resources on Dictionaries

5839

Answer #2

In your case, what you can do is:

z = dict(list(x.items()) + list(y.items()))

This will, as you want it, put the final dict in z, and make the value for key b be properly overridden by the second (y) dict"s value:

>>> x = {"a":1, "b": 2}
>>> y = {"b":10, "c": 11}
>>> z = dict(list(x.items()) + list(y.items()))
>>> z
{"a": 1, "c": 11, "b": 10}

If you use Python 2, you can even remove the list() calls. To create z:

>>> z = dict(x.items() + y.items())
>>> z
{"a": 1, "c": 11, "b": 10}

If you use Python version 3.9.0a4 or greater, then you can directly use:

x = {"a":1, "b": 2}
y = {"b":10, "c": 11}
z = x | y
print(z)
{"a": 1, "c": 11, "b": 10}

5839

Answer #3

An alternative:

z = x.copy()
z.update(y)

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