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Python for Beginners - Learn Python in 1 HourProgramming 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 set it to 2 now. If you run our program again
and type exit out of it. You will see that our while loop condition has been met
, six times now let's add another counter and set it to 3. Now If you run our
program again and type exit out of it, you will see that our while loop condition
has been met nine times now finally let's add another counter and set it to 4.
Now. If you run our program again and type exit out of it. You will see that our
while loop condition has been met 12 times. So this is how we can use the while
loop in Python to write a value to the user. So next time I 'll show you how to
read values from the user and how to write values to the user. THe passage
discusses how an error occurred in a program. THe error was caused by
attempting to subtract a string from an integer, which Python does not support.
TO solve the problem, the author converted the string to an integer and solved
the problem.. function is the string that we got from the input function now let's
run the program so 10 and 20.1 and here 's the result In. This passage, the
author explains how to solve a problem in Python where two numbers are being
combined together as strings.. THe first number is read into a variable, and the
second number is read into a second variable.. THe sum of the two numbers is
then calculated using the float function, which converts both numbers to their.
numeric representations. Finally, the sum of the two numbers is displayed on the
terminal. One way to solve This problem would be to use the int function, which
would convert both numbers to integers. However,. Since we're dealing with
strings, we need to use the float function instead. Additionally,. Since we're not
required to use the float function, we could have just called it at the time. We
wanted to calculate the sum of the two numbers. IN conclusion,. This passage
provides some insights into how to solve a problem in Python where two
numbers are being combined together as strings.. The first step is to read in the
first number into a variable, and the second step is to read in the second
number.. The sum of the two numbers is then calculated using the float function,
which converts both numbers to their numeric representations.. Finally, the sum
of the two numbers is displayed on the terminal..
Ia, you can see the course variable has been updated to say y y y y now I 'll
delete that line and let's run the program again. You should see two now. We
can also use the find method to look for a specific character in our string. So if
we wanted to find the character at index 3 in our string. We could do
course.find(3) and as Ia you can see that function returned the value 4. So this is
another really useful function for finding specific values in strings. Now let's take
a look at one last function called split and this function will take a string as input
and it will split that string into an array of characters. So if we pass course.split()
as ia, you can see that function has divided our string into an array of three
characters. Now let's use this array. to do some math. We can use the len
function to get the length of our array and then we can use the range function
to see if our number is between 0 and 9. So in this case our number is 5. So we
would type 5, 6, 7, 8, 9, and so on now. This is a really useful function because it
allows us to do basic math operations on strings without having to worry about
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