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Introduction
- The function is a block of code which only runs when it’s called. It performs a single related action.
- Function block begins with def followed by the function name and parentheses ().
- Any inputs or arguments are put inside those parentheses
- The code block within every function starts with a colon (:) and is indented
- The statement return [expression] exits a function, optionally passing back an expression to the caller. A return statement with no arguments is the same as return none.
Syntax
def functionName (parameters):
“function_docstring”
Function
suite
return [expression]
Calling a Function
By defining a function and give it a name and a parameter,
we can call it anytime in the code
it gives an output the name that you have input into the function as a parameter, in that Case, it will give output: Ahmed
Parameters
You can add more than one parameter, as many parameters as you want, you should comma between each parameter and the one after
Also, you can add a default parameter, in case you didn’t add a one by yourself the code prints the default
It gives output
You can also pass a list as a parameter
It gives an output
Return Values
You can add the output values by using changing it from the
return
It gives an output
Recursion Function
Recursion is a common mathematical programming concept, It means that a function calls itself. This
has the benefit of meaning that you can loop through data to reach a result.
Recursion function means that you can make a function that
calls itself several times
And it gives output
