Web Reference: In this lesson you will learn how to define your own function, with the ability to accept an input and return an output. We then learn how to call the functi... Python Functions A function is a block of code which only runs when it is called. A function can return data as a result. A function helps avoiding code repetition. Functions are a convenient way to divide your code into useful blocks, allowing us to order our code, make it more readable, reuse it and save some time. Also functions are a key way to define interfaces so programmers can share their code.
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