Python for Beginners – Full Course [Programming Tutorial]

in this full course you will learn the

basics of python programming

i'm beau carnes with freecodecamp.org

i've previously created one of the most

popular javascript courses on youtube

and i've created many python tutorials

now i've created this complete python

course for beginners you don't need any

previous programming experience to

follow along and all you need to code in

python is a web browser in this course i

will teach you all the core aspects of

the python programming language and i

will simplify the more complex topics

python is considered one of the most

popular programming languages in the

world and it's only growing in

popularity python excels in a wide

variety of scenarios such as shell

scripting task automation and web

development and it's also the language

of choice for data analysis and machine

learning but it can also adapt to create

games and work with embedded devices

we're going to jump right into it so you

can start coding your first python

program as soon as possible to get

started quickly we'll use a replit which

is an online ide that allows users to

code and run programs in a variety of

different languages all in a web browser

and later i'll show you how to get

python set up on your local operating

system after the first project i'll go

into more detail about each of the main

features of python the section is

comprehensive and detailed and in the

final section you will use what you've

been learning to code a blackjack game

with me guiding you every step of the

way throughout the course there will be

a little repetition of some of the key

python programming concepts to make sure

you have a deep understanding of the

language so let's get started we're

going to start by creating a simple rock

paper scissors game and we'll start by

going to replit.com replied provided a

grant that made this course possible and

replie is going to make it super easy to

get up and running really quickly so you

can either sign up or log in

and create an account i'm just going to

use my google account

okay now that you're logged into replit

you can either just click the create

button or this plus button over here to

create a new replit and i'll make sure

to create a python replit but you can

see you can also select all sorts of

different programming languages oh these

are just the ones that start with the

word python but so there's there's tons

of different programming languages you

can select but in this case we are just

going to use python and then i'll click

create reple

okay so let me just kind of show off

replica a little bit

this is where we're going to create our

python code i'm going to zoom in just a

little bit so we're going to write the

code right here and then we can see some

output over on the right side and then

you can create different files over on

the left side here

and then there's some other things like

you can connect to version control

and

if you have environment variables we're

not even going to be discussing those in

this course there's a debugger you can

connect to a database and just some

other things but we're mainly going to

just be using this main.pi program to

write our program and we're going to see

the results in the console so i'm just

going to close this files window so

it's a little bigger here

i'm going to start off by showing you

how to create a variable with python so

this is a rock paper scissors game and

there's going to be a players a player

is going to have a choice and a computer

is going to have a choice so i'm going

to create a variable called player

choice

and i'm going to set that equal to

rock

so let's look at a few components about

this this is the variable name player

choice

and you can see

if you

we use an underscore that's just kind of

the convention for python to use an

underscore if you're going to have a

space in the variable name and we're

going to assign it that's what this

equal sign this is the assign operator

and we're going to assign it to a string

a string is just a word or a collection

of characters like rock and we're going

to put quotation marks around it now we

could have also used a single quotes

instead of double quotes as long as you

use the same quote on each side that's

what's important so we've now created a

variable

called

playerchoice and assigned it to rock and

now we can reference this variable later

and whenever we reference the variable

called playerchoice it's going to

the code is going to automatically

replace that player choice with rock

so this is going to be a very

interactive project i hope you're

following along i hope you have already

got replit loaded up like this now

throughout this project i'm going to

tell you what the next thing to do is

and i want you to try doing it yourself

before you watch what i'm going to do so

periodically you'll want to pause the

video

based on and what i say you and try to

implement what i say

before you come back to the video and

watch me implement it and see if you've

implemented the the same way

so i'm just going to zoom in one more

time and

this is the first thing i want you to do

see if you can make another variable on

the next line so you're going to press

return or enter to go to the next line

and this variable should be called

computer choice and you should set it to

equal

paper

okay so you can pause the video and see

if you can make a variable called

computer choice and set it to equal

paper

so here it's pretty simple here it's

going to start simple but it's going to

get harder as we go so computer choice

equals

paper okay so like i said it's starting

simple but it's going to get more

complex as we go along

if you've done that you've now written

your first line of python code in this

course

okay now i'm going to talk about

functions

a function is a set of code which only

runs when it is called

so i'm going to show you how to put this

code into a function

now one thing about python is that

indentation is very important

so after we create a we define the name

of a function any line of code that's

indented the same amount is considered

within that function

so i'm going to create a new line of

code at the top and i'm going to call it

get

choices

okay so we define the function with def

and get choices and i'm going to select

all these these two lines of code at the

same time and just press the tab key and

that's going to indent all these the

same amount

and you can see sometimes they'll be

squiggly lines and if you hover over

some of the squiggly lines it will tell

you something in this case it just says

the local variable called player choice

is assigned to but never used that's not

necessarily bad it's just it's just

telling us that usually if you create a

variable you're going to want to use it

later well we are going to use it later

we just haven't gotten to it yet so

sometimes the squiggly lines will

indicate there's some sort of error in