Python for Beginners - Learn Python in 1 Hour
Programming with Mosh
Iphone or iPad you need to install a couple of other things first
so you go to the App Store and search for Pycharm. Then in the
App Store click on the install button. Now. Once Pycharm is
installed, you can open it up by clicking on this icon. Here in
your downloads folder. You should also have a.py file. So let's
open that up now. The first thing you 're going to do is create a
new project so let's do that by clicking on this green plus sign
here in your project explorer window and type in Python. This is
the name of your project. Now let's choose a location for your
project so we're going to choose a folder on our computer called
projects and then click on the create Button Now let's change
some settings inside of Pycharm. So first thing you 're going to.
To want to do is change the language of your project to Python,
So inside of pycharm. Go to File > Settings > Project Settings
and in the Languages section change Python to the language of
your project. Now next thing you 're going to want to do is set
up your project folder so inside of pycharm go to File > Settings
> Project Structure and in the Project Folder section click on
the Browse button and then select the folder where you want your
project files to live so now Your project is set up and ready to
go all right let's start writing some code. We're going to start
with the simplest code possible and that's a hello world program.
In Python. A Hello world program is simply a program that prints
out hello world so let's open up our.py file and enter this code
here. Here import sys [UNK] world!") all right so we've imported
the Sys module and then we've printed out [UNK] world!" now Let's
save our file by clicking on this green button here in your
editor window and call it Hello.py now let's run our program by
clicking on this green run button here inside of pycharm and
you'll see that our program has printed out [UNK] world!" all
right that's our first simple code block in Python now Let's take
a look at some more code blocks in Python. First thing we'll want
to do is create a variable, so let's open up our hello.py file
again and enter this code def [UNK] [UNK] world!") all right so
we've defined a function called say hello() we're going to print
out [UNK] world!" now let's save our file once again say we want
to declare a variable called price. We would type price and then
after we type the name of the variable. We would put a colon and
then the value of that variable. So in this case, the value of
this variable will be 12.99. So we can use this variable anywhere
inside our Python code now let's say we want to print the value
of this variable. We can do that by simply writing print price
and then after that we would put a period and then the value of
the variable. So in this case the code would print out 12.99
alright. Now let 's say we wanted to change the value of this
, variable. We can do that by simply typing new value for price and
then after that we would type a colon and then the new value of
the variable. So in this case the code would print out 13.00
alright. Now let's say we wanted to delete this variable. We can
do that by simply typing delete price and then after that we
would type a period and then hit enter so In this case, the code
would delete the variable called price Alright. Now let's talk
about lists. Let's say we have a list of items and we want to
display. each item in turn on our application window so to do
that we need to use a for loop so to declare a for loop. We would
type for item in list, and then after that we would type
parenthesis, then the list item and then after that hit enter so
In this case, the code would run for each item in the list called
list and then it would go inside the parentheses and it would
assign the item inside those parentheses to the variable called
item. So in this case, the code would print out apple Banana
cherry pineapple, so you can see how this works if you wanted to
change what was inside those parentheses. You could do that by
simply typing different values for parenthesis. So in this case,
I typed apple Banana cherry pineapple. So now you understand how
to use a for loop alright. Now last but not least let's talk
about functions. Functions are blocks of code that you can use in
your python programs to simplify your code or to make it more
powerful. You can think of functions as mini-programs inside your
python program, So you can see here is a function called square
which is just a simple function that takes one parameter which is
called a number, and it returns the square of that number. Okay
now let's say we wanted to call this function inside our for loop
so to do that we would type square(12.99) inside our for loop and
after that hit enter so. In this case the code would run and it
declare and use variables in python.
You run the program and you get this message. The age of John
Smith is 1990 okay. So this is how we can use the input function
in Python to read a value from the user now. In addition to
reading values from the user, we also have the ability to write
values to the user. So let me show you how we do that so we first
create a variable called message and set it to the string 'please
enter your message' now we use the print function to print our
message on the terminal window so you can see it here now. Let's
run our program and see what happens so please enter your message
so we get this message now. What we want to do is display this
message for as long as the user remains in our program. So we use
the while loop so we type while True which means while the
condition is True. So In this case the condition is that our
message variable is not empty and that 's why we put a comma
after while because that 's what tells Python to keep looping
Programming with Mosh
Iphone or iPad you need to install a couple of other things first
so you go to the App Store and search for Pycharm. Then in the
App Store click on the install button. Now. Once Pycharm is
installed, you can open it up by clicking on this icon. Here in
your downloads folder. You should also have a.py file. So let's
open that up now. The first thing you 're going to do is create a
new project so let's do that by clicking on this green plus sign
here in your project explorer window and type in Python. This is
the name of your project. Now let's choose a location for your
project so we're going to choose a folder on our computer called
projects and then click on the create Button Now let's change
some settings inside of Pycharm. So first thing you 're going to.
To want to do is change the language of your project to Python,
So inside of pycharm. Go to File > Settings > Project Settings
and in the Languages section change Python to the language of
your project. Now next thing you 're going to want to do is set
up your project folder so inside of pycharm go to File > Settings
> Project Structure and in the Project Folder section click on
the Browse button and then select the folder where you want your
project files to live so now Your project is set up and ready to
go all right let's start writing some code. We're going to start
with the simplest code possible and that's a hello world program.
In Python. A Hello world program is simply a program that prints
out hello world so let's open up our.py file and enter this code
here. Here import sys [UNK] world!") all right so we've imported
the Sys module and then we've printed out [UNK] world!" now Let's
save our file by clicking on this green button here in your
editor window and call it Hello.py now let's run our program by
clicking on this green run button here inside of pycharm and
you'll see that our program has printed out [UNK] world!" all
right that's our first simple code block in Python now Let's take
a look at some more code blocks in Python. First thing we'll want
to do is create a variable, so let's open up our hello.py file
again and enter this code def [UNK] [UNK] world!") all right so
we've defined a function called say hello() we're going to print
out [UNK] world!" now let's save our file once again say we want
to declare a variable called price. We would type price and then
after we type the name of the variable. We would put a colon and
then the value of that variable. So in this case, the value of
this variable will be 12.99. So we can use this variable anywhere
inside our Python code now let's say we want to print the value
of this variable. We can do that by simply writing print price
and then after that we would put a period and then the value of
the variable. So in this case the code would print out 12.99
alright. Now let 's say we wanted to change the value of this
, variable. We can do that by simply typing new value for price and
then after that we would type a colon and then the new value of
the variable. So in this case the code would print out 13.00
alright. Now let's say we wanted to delete this variable. We can
do that by simply typing delete price and then after that we
would type a period and then hit enter so In this case, the code
would delete the variable called price Alright. Now let's talk
about lists. Let's say we have a list of items and we want to
display. each item in turn on our application window so to do
that we need to use a for loop so to declare a for loop. We would
type for item in list, and then after that we would type
parenthesis, then the list item and then after that hit enter so
In this case, the code would run for each item in the list called
list and then it would go inside the parentheses and it would
assign the item inside those parentheses to the variable called
item. So in this case, the code would print out apple Banana
cherry pineapple, so you can see how this works if you wanted to
change what was inside those parentheses. You could do that by
simply typing different values for parenthesis. So in this case,
I typed apple Banana cherry pineapple. So now you understand how
to use a for loop alright. Now last but not least let's talk
about functions. Functions are blocks of code that you can use in
your python programs to simplify your code or to make it more
powerful. You can think of functions as mini-programs inside your
python program, So you can see here is a function called square
which is just a simple function that takes one parameter which is
called a number, and it returns the square of that number. Okay
now let's say we wanted to call this function inside our for loop
so to do that we would type square(12.99) inside our for loop and
after that hit enter so. In this case the code would run and it
declare and use variables in python.
You run the program and you get this message. The age of John
Smith is 1990 okay. So this is how we can use the input function
in Python to read a value from the user now. In addition to
reading values from the user, we also have the ability to write
values to the user. So let me show you how we do that so we first
create a variable called message and set it to the string 'please
enter your message' now we use the print function to print our
message on the terminal window so you can see it here now. Let's
run our program and see what happens so please enter your message
so we get this message now. What we want to do is display this
message for as long as the user remains in our program. So we use
the while loop so we type while True which means while the
condition is True. So In this case the condition is that our
message variable is not empty and that 's why we put a comma
after while because that 's what tells Python to keep looping
