Type programs into the file editor (not in the interactive shell window with the >>> prompt)
The execution starts at the top and moves down.
Comments begin with a # character and are ignored by Python; they are notes & reminders for the programmer.
Functions are like mini-programs in your program.
The print() function displays the value passed to it.
The input() function lets users type in a value.
The len() function takes a string value and returns an integer value of the string's length.
The int(), str(), and float() functions can be used to convert values' data type.