PYTHON BASICS
Local and global variables
Variables created inside a function are local to that function. They cannot be seen or used outside. Variables created outside functions are global and can be read anywhere.
How it reads
sky = "neon" is a global variable accessible inside and outside paint()
cloud = "puffy" is a local variable only accessible inside paint()
Cloud tip: Keeping variables local helps prevent errors, because different functions won't accidentally overwrite each other's data.