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 gr een plus sign here in your project explorer window and type in Python This is the name of your project N ow let s choose a location for your project so we re going to choose a folder on our computer called projec ts and then click on the create Button Now let s change some settings inside of Pycharm So first thing yo u re going to To want to do is change the language of your project to Python So inside of pycharm Go t o 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 s elect the folder where you want your project files to live so now Your project is set up and ready to go all ri ght let s start writing some code We re going to start with the simplest code possible and that s a hello wo rld 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 h ere in your editor window and call it Hello py now let s run our program by clicking on this green run butto n here inside of pycharm and you ll see that our program has printed out UNK world all right that s our fi rst simple code block in Python now Let s take a look at some more code blocks in Python First thing we l l want to do is create a variable so let s open up our hello py file again and enter this code def UNK UN K 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 S o 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 an d 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 wou ld 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 ite m 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 parenthes es and it would assign the item inside those parentheses to the variable called item So in this case the c ode would print out apple Banana cherry pineapple so you can see how this works if you wanted to chan ge 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 alr ight Now last but not least let s talk about functions Functions are blocks of code that you can use in you r python programs to simplify your code or to make it more powerful You can think of functions as mini pr ograms inside your python program So you can see here is a function called square which is just a simpl e function that takes one parameter which is called a number and it returns the square of that number O kay 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 v ariables in python You run the program and you get this message The age of John Smith is 1990 okay So this is how we c an use the input function in Python to read a value from the user now In addition to reading values from t he user we also have the ability to write values to the user So let me show you how we do that so we firs t create a variable called message and set it to the string please enter your message now we use the pri nt 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 i s display this message for as long as the user remains in our program So we use the while loop so we ty pe while True which means while the condition is True So In this case the condition is that our message v ariable 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 …