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sure! custom functions in python are a core concept that allows you to create reusable blocks of code. this makes your programs easier to read, maintain, and debug. let's go through an introduction to custom functions using python, including their definition, usage, and some examples.

what is a function?

a function is a block of code that only runs when it is called. you can pass data, known as parameters, into a function. a function can return data as a result.

defining a function

in python, you define a function using the `def` keyword, followed by the function name and parentheses. if the function takes parameters, you specify them within the parentheses.

syntax



**function_name**: this is the name of the function. it should be descriptive and follow the naming conventions.
**parameters**: these are optional inputs to the function.
**return**: this statement sends back a value from the function. it is optional; if omitted, the function returns `none` by default.

example 1: a simple function

let's create a simple function that prints a greeting message.



*output:*


example 2: function with return value

now, let's create a function that adds two numbers and returns the result.



*output:*


example 3: function with default parameters

you can define default values for parameters in functions. if a caller does not provide a value for that parameter, the default value is used.



*output:*


example 4: function with variable number of arguments

you can use `*args` and `**kwargs` to allow your function to accept a variable number of arguments.



*output:*


example 5: return multiple values

a function can also return multiple values as a tuple.



*output:*


conclusion

creating custom functions in python helps you organize your code better. you can easily reuse code, making your programs more efficient. in this tutorial, we've covered the basics of defining and using functions, including parameters, return values, default pa ...

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