in this python tutorial you're going to learn everything you need to know to
start programming in python if you want to learn python programming for data
science machine learning or web development this python tutorial is the perfect
place to learn python you don't need any prior knowledge in python or programming
in general i'm going to teach you everything from scratch i'm mosh hamadani and
i've taught millions of people how to code through this channel if you're new here
make sure to subscribe as i upload new videos every
week now let's jump in and get started all right before we get started let me
give you some ideas about what you can do with python that's a very common question
python is a multi-purpose programming language so you can use it for a variety of
different tasks you can use python for machine learning and ai in fact python is
the number one language for machine learning and data science projects python is
also very popular in web development using python and a framework called django you
can build amazing websites here are five
websites powered with python and django youtube instagram spotify dropbox and
pinterest you can also use python in automation with python you can save your time
and increase your productivity by automating repetitive tasks so why are you
learning python are you learning it for automation for data science or web
development let me know in the comment section below all right the first thing i
want you to do is to head over to python.org to download the latest version of
python so you go to downloads and select the
latest version of python here in your downloads folder you should see this
package simply double click it you're going to see this python installer if you're
on windows you will see this checkbox over here add python to path make sure to
check it it's really important otherwise you're not going to be able to follow this
tutorial simply click on continue again one more time i agree with the terms and
install the latest version of python now here you need to enter the username
password of your computer
so let's do that real quick next you need to install a code editor we use a
code editor to write our code and execute it the most popular code editor for
python is pycharm you can get it from jetbrains.com pycharm so on this page click
on download you should see two different editions one is the professional edition
which is commercial and we also have this community edition which is free and open
source so we're going to download the community edition now in your downloads
folder you should have this package let's double click it
if you're on windows you're going to see an installation wizard so simply click
on the next button until you install pycharm if you're on a mac you need to drag
this pycharm and drop it onto the applications folder now let's open it the first
time you open pycharm you have to configure a few settings we don't want to spend
time on this so over here we're going to click on skip remaining and set defaults
now let's create a new project over here we can specify the location and the name
of our python project so
let's append hello world to this path this is where our python project is going
to be saved so let's click on create in this window you can see the content of our
project so here's our hello world project currently we have only one folder inside
this project that is vn which is short for virtual environment we'll talk about
virtual environments in the future so currently we don't have any python files
inside this project a real application can consist of tens or hundreds or even
thousands of python
files so let's right click on the project name and go to new python file we're
going to call this file up now we can collapse this project window by clicking on
, this icon so now we have more space let's write our first python code we're going
to write print all in lowercase then add parentheses then add quotes either single
quotes or double quotes and inside this code we're going to write hello world so
this is what we call a string a string means a string or sequence of characters in
simple words that means
textual data so in python and in many other programming languages whenever
we're dealing with textual data we should always surround our text with quotes in
python we can use single or double quotes now this print you see here is a function
built into python and we can use it to print a message on our application window so
let me show you how to run this code on the top we go to the run menu and then
select run note that there is a shortcut associated with this command i always use
shortcuts because they increase my productivity so
let's click on this now select app and over here you can see this little window
this is what we call the terminal window and it shows the output of our program so
here's the hello world message printed in the terminal window now as you learn more
python you will learn how to build applications that have a graphical user
interface that's an advanced topic so for now let's not worry about it alright now
let's talk about variables we use variables to temporarily store data in a
computer's memory for example
we can store the price of a product or someone's name their email their age and
so on let me show you so to declare a variable we start by typing a name for that
variable let's say age then we add an equal sign and then we type a value let's say
20. so with this we're storing the number 20 somewhere in our computer's memory and
we're attaching this age as a label for that memory location so now we can read the
value at this memory location and print it on the terminal so instead of printing
hello world we want to print
the value of the age variable so i'm going to delete what we have inside
parenthesis and type age note that i'm not adding quotes because if i run this
program we'll see the text h on the terminal we don't want that we want the value
of the age variable so let's remove the quote and print the value of the age
variable now here on the toolbar you can click on this play icon to run your
program or you can use the shortcut that i showed you in the last video so the
shortcut is over here on a mac that's ctrl shift and
r so there you go now you can see the value of the age variable now we can also
change the value of a variable for example on line 2 we can set 8 to 30. now when
we run our program we see 30. so as you can see our program gets executed from top
to bottom so this is how we can declare and use a variable now let's look at a few
more examples so i'm going to declare another variable called price and set it to
19.95 so in python we can use numbers with a decimal point or whole numbers we can
also declare a
variable and assign it a string value so let's say first underline name so if
you want to use multiple words in the name of a variable we should separate them
using an underscore this makes our code more readable see what would happen if i
didn't use this underline this is not easily readable so we always separate
multiple words by an underscore now we set this to a string so we can use single
quotes or double quotes let's say march we also have a special type of value called
a boolean value which can be true
or false that is like yes or no in english let me show you so i'm going to
declare another variable called is online and set it to true we could also set it
to false what we have here is called a boolean value now note that python is a case
sensitive language so it's sensitive to lowercase and uppercase letters in this
case if i use a lowercase f we can see an error over here because this is not
start programming in python if you want to learn python programming for data
science machine learning or web development this python tutorial is the perfect
place to learn python you don't need any prior knowledge in python or programming
in general i'm going to teach you everything from scratch i'm mosh hamadani and
i've taught millions of people how to code through this channel if you're new here
make sure to subscribe as i upload new videos every
week now let's jump in and get started all right before we get started let me
give you some ideas about what you can do with python that's a very common question
python is a multi-purpose programming language so you can use it for a variety of
different tasks you can use python for machine learning and ai in fact python is
the number one language for machine learning and data science projects python is
also very popular in web development using python and a framework called django you
can build amazing websites here are five
websites powered with python and django youtube instagram spotify dropbox and
pinterest you can also use python in automation with python you can save your time
and increase your productivity by automating repetitive tasks so why are you
learning python are you learning it for automation for data science or web
development let me know in the comment section below all right the first thing i
want you to do is to head over to python.org to download the latest version of
python so you go to downloads and select the
latest version of python here in your downloads folder you should see this
package simply double click it you're going to see this python installer if you're
on windows you will see this checkbox over here add python to path make sure to
check it it's really important otherwise you're not going to be able to follow this
tutorial simply click on continue again one more time i agree with the terms and
install the latest version of python now here you need to enter the username
password of your computer
so let's do that real quick next you need to install a code editor we use a
code editor to write our code and execute it the most popular code editor for
python is pycharm you can get it from jetbrains.com pycharm so on this page click
on download you should see two different editions one is the professional edition
which is commercial and we also have this community edition which is free and open
source so we're going to download the community edition now in your downloads
folder you should have this package let's double click it
if you're on windows you're going to see an installation wizard so simply click
on the next button until you install pycharm if you're on a mac you need to drag
this pycharm and drop it onto the applications folder now let's open it the first
time you open pycharm you have to configure a few settings we don't want to spend
time on this so over here we're going to click on skip remaining and set defaults
now let's create a new project over here we can specify the location and the name
of our python project so
let's append hello world to this path this is where our python project is going
to be saved so let's click on create in this window you can see the content of our
project so here's our hello world project currently we have only one folder inside
this project that is vn which is short for virtual environment we'll talk about
virtual environments in the future so currently we don't have any python files
inside this project a real application can consist of tens or hundreds or even
thousands of python
files so let's right click on the project name and go to new python file we're
going to call this file up now we can collapse this project window by clicking on
, this icon so now we have more space let's write our first python code we're going
to write print all in lowercase then add parentheses then add quotes either single
quotes or double quotes and inside this code we're going to write hello world so
this is what we call a string a string means a string or sequence of characters in
simple words that means
textual data so in python and in many other programming languages whenever
we're dealing with textual data we should always surround our text with quotes in
python we can use single or double quotes now this print you see here is a function
built into python and we can use it to print a message on our application window so
let me show you how to run this code on the top we go to the run menu and then
select run note that there is a shortcut associated with this command i always use
shortcuts because they increase my productivity so
let's click on this now select app and over here you can see this little window
this is what we call the terminal window and it shows the output of our program so
here's the hello world message printed in the terminal window now as you learn more
python you will learn how to build applications that have a graphical user
interface that's an advanced topic so for now let's not worry about it alright now
let's talk about variables we use variables to temporarily store data in a
computer's memory for example
we can store the price of a product or someone's name their email their age and
so on let me show you so to declare a variable we start by typing a name for that
variable let's say age then we add an equal sign and then we type a value let's say
20. so with this we're storing the number 20 somewhere in our computer's memory and
we're attaching this age as a label for that memory location so now we can read the
value at this memory location and print it on the terminal so instead of printing
hello world we want to print
the value of the age variable so i'm going to delete what we have inside
parenthesis and type age note that i'm not adding quotes because if i run this
program we'll see the text h on the terminal we don't want that we want the value
of the age variable so let's remove the quote and print the value of the age
variable now here on the toolbar you can click on this play icon to run your
program or you can use the shortcut that i showed you in the last video so the
shortcut is over here on a mac that's ctrl shift and
r so there you go now you can see the value of the age variable now we can also
change the value of a variable for example on line 2 we can set 8 to 30. now when
we run our program we see 30. so as you can see our program gets executed from top
to bottom so this is how we can declare and use a variable now let's look at a few
more examples so i'm going to declare another variable called price and set it to
19.95 so in python we can use numbers with a decimal point or whole numbers we can
also declare a
variable and assign it a string value so let's say first underline name so if
you want to use multiple words in the name of a variable we should separate them
using an underscore this makes our code more readable see what would happen if i
didn't use this underline this is not easily readable so we always separate
multiple words by an underscore now we set this to a string so we can use single
quotes or double quotes let's say march we also have a special type of value called
a boolean value which can be true
or false that is like yes or no in english let me show you so i'm going to
declare another variable called is online and set it to true we could also set it
to false what we have here is called a boolean value now note that python is a case
sensitive language so it's sensitive to lowercase and uppercase letters in this
case if i use a lowercase f we can see an error over here because this is not
