2. Functions def

• We learned some Python functions: len, int, float, print, and input.

• Now we will create our own functions.

• I use def to define the function and return to return a value.

• There are functions that do not return anything.

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• This function returns True if the parameter x is even, False otherwise.

• Note that, unlike what we have seen so far, these lines of code will not be executed immediately.

• It is necessary to call the function to execute them.

2.1. Example

• Define a function factorial

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