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The python code you'll be racing to type out is all about:
Reals are numbers that can contain a decimal place.
Constants store a value that is set once and then never changes.
Real constants let you give a decimal number a name so you can use it to make your code easier to read or to set options for your code that the user wont be able to change.
In this example, a constant called PI is set to the real value of 3.141