how the "hello worldprogram works each line of code is an instruction interpreted by python these instructions make up the program computer program' instructions are like the steps in cookbook recipe each instruction executes in orderbeginning from the top of the program and going down the list of instructions the step python is at in the program is called the execution when the program startsthe execution is at the first instruction after executing the instructionthe execution moves down to the next instruction let' look at each line of code to see what it' doing we'll begin with line number comments this program says hello and asks for my name this instruction is comment any text following sign (called the pound signis comment comments are not for pythonbut for youthe programmer python ignores comments comments are the programmer' notes about what the code does you can write anything in comment to make it easier to read the source codethis book prints comments in light graycolored text programmers usually put comment at the top of their code to give their program title functions function is kind of like mini-program inside your program functions contain several instructions to execute when the function is called python provides some built-in functions already two functionsprint(and input()are described next the great thing about functions is that you only need to know what the function doesbut not how it does it function call is an instruction that tells python to run the code inside function for exampleyour program calls the print(function to display string on the screen the print(function takes the string you type between the parentheses as input and displays the text on the screen to display hello worldon the screentype the print function namefollowed by an opening parenthesisfollowed by the 'hello world!string and closing parenthesis the print(function print('hello world!'post questions to