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 cli...
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() and inside of 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 while this
condition is met okay now if you type exit out of our program right now
you will get an error message because our while loop condition is not
met Okay. So now let's add a counter to our program. So we can keep
track of how many times our while loop condition has been met. So we
add a variable called counter and set it to 1. Now if you run our
program again and type exit out. of it, you will see that our while loop
condition has been met four times. Now Let's add another counter and
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