Name: Python 絕對初學者教程 #1 - 什麼是變量？ (Python Tutorial for Absolute Beginners #1 - What Are Variables?)
Uploaded: 2021-01-14T10:20:18.000Z
Duration: 24 min 38 s
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Hey everyone, my name is YK. And i'm the founder of this YouTube channel CS

Dojo, and i'm also a former software developer at

Tutorial for absolute beginners and this is my video number 1: what are variables?

So this series is gonna be good for complete beginners, who have never done any programming before as

Well as someone who's done some programming before whether it's python or any other language but

Wants to learn more about python. So in this video i'm going to go through a number of different things

you, do with it and then i'm gonna explain how. To install python on your computer and then set up a development environment.

We're gonna use something called jupyter notebook throughout, this series and then i'm gonna explain how. To use the print function

And what are variables and how to use them and by the end of this video if you have two variables

Storing different things, you'll be able to swap the content within those two variables with

an outline of this video in the comment section below

So you, don't have to watch the whole thing if you, don't want to. Oh and before we get started if you?

Want to make sure that you don't, miss my future tutorial videos sign up to my, newsletter which is available in the description?

Below so just quickly, what is python and what can?

You, do with it it's one of the most popular programming languages out there and it's used at smaller companies as

well as larger companies including google and many

Universities use python as the introductory programming language in their computer science courses and one advantage of python

Is that it's fairly easy to learn because it has fairly simple syntax

It's used for many different applications

Including websites back-end code which is the code that runs on your server as

Opposed to the code that runs on your device whether it's a phone or a Laptop and it's

also popular for their analysis and scientific research purposes, okay?

So let's now go ahead and install python on your computer usually

When people develop a program using python or any other language for that matter they usually

Use something called ide which stands for integrated development environment. It's an environment that includes

Everything you need pretty much to develop a program. It has a nice text editor in which you can

Write your code and then the ability to run your program as, well as something called a debugger

Which allows you to quickly get rid of all the bugs in your program and if you, want to use an IDE to follow

My series i personally recommend park charms community edition so in this series instead of using a traditional

IDE i decided to use something called jupyter notebook

So jupyter notebook is an environment for writing and testing your program quickly and

It's actually, popular with the scientific community and for data analysis purposes but i've decided to use jupiter notebook throughout

This series because it's very simple and easy to install

Jupyter notebook through something called anaconda and it's fairly easy to use as

Well so here's the way, jupyter notebook, works there are two components to jupyter notebook

First of all when you launch jupyter notebook on your computer you might see a command line interface like this

This, represents the jupyter notebook server

You can, think of it sort of like the core of jupyter notebook and you don't have to worry that much about how

But just remember that if you close this window. Maybe accidentally jupyter notebook might stop working so just be careful about that

Now, when you launch jupyter on your computer you might?

also See a browser window or tab showing up whether it's Chrome, Firefox, Safari, or anything else and

Localhost call eight eight eight eight or something like that and it'll be connected to the jupyter notebook server

Browser window or tab is basically the user interface for jupyter notebook and you can write and execute your code

Here but it's actually executed on the jupyter notebook server, again. You don't have to worry that much about, how

It works exactly but this is just an overview

Now to install python and jupyter notebook we're, going to use something called anaconda

Anaconda is something called a package manager

which allows you to install many programs at once

This, particular package manager' anaconda is actually used for installing math and science libraries but

You, don't have to worry, about that the only thing you need to know

Is that when you install anaconda it comes with python and jupyter notebook so you

Don't have to install python or jupyter notebook separately on your computer

Let's now install python and jupyter through anaconda go to anaconda org, and then click download

Select whatever platform you're using whether it's windows mac or linux

I'm using mac here so i'm gonna click mac os here and there are two options here

Python, three-point-something or python 2 point something, make sure to use python 3 point something because we're

going to use python 3 instead of python 2 throughout

This, course so click download and then save this file wherever

You, want to save it and once this file is downloaded just open it and then click continue continue continue

Install for me only or install on a specific disk it doesn't matter which one you choose and then click install and

This, process will probably take a, while for you

Once this process is done you should see something like the installation, was completed successfully

Once you see that just click close and you're all set to launch jupyter you need to launch an application called

Just launch that in the usual way you launch any other application, and then find jupyter notebook and click launch

Like i said before you see a browser tab or window. Opening up and it should be at the url

Localhost colon 8080 8th 8th or something like that

First go to whatever the folder you, want to create. Your first program, in i'm going to go to desktop

And once you click it you can see that my current location is desktop because it's at the top right here

Before you create. Your first program here i personally recommend that you create a

New folder so i just went to my desktop i clicked right click and then, new

once you create that folder you should see in the jupyter notebook interface to click that and you see that the current location is

Python, tutorial one within desktop right here at the top to create a, new, file or a, new?

notebook, file as i say just click new at the top right hand corner and then click python 3

So a new notebook has been created, here change the name of this notebook from untitled to

Once you, do that if you go back to desktop and the folder that

we just created python tutorial 1 you'll see a, new

File what our variables dot i pi and b and that i pi and b is just an extension for algebra notebook?

Now in jupyter notebook there's something called a

Cell each cell represents a set of code and the box you're looking at right now is one cell

So you can, type in any python code here for example print

Parentheses double quotes hello world and when you run, this? Cell

Using this button at the top it executes all the code within the. Cell, so let's run, this. Cell and

You, see that the string hello, world, is printed so this text hello?

World is something called a string it's usually enclosed by either double quotes or single

Quotes and it's basically just a set of characters so

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Python 絕對初學者教程 #1 - 什麼是變量？ (Python Tutorial for Absolute Beginners #1 - What Are Variables?)

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