Concept: Function parameters

A function has two types of parameters: positional and keyword parameters. Positional parameters are required and must be passed in the correct order, while keyword parameters are optional and can be passed in any order by specifying the parameter name. Keyword parameters allow for more flexibility in function calls, as they can be omitted or specified in any order. Each keyword parameter must have a default value, which is used if the parameter is not specified in the function call.

def function_name(positional_param1, positional_param2, keyword_param1=None, keyword_param2=None):
    """
    A function with 2 positional parameters and 2 keyword parameters.
    """
    # code block
    return output_value

This function can be called in the following ways:

result1 = function_name(arg1, arg2) 
result2 = function_name(arg1, arg2, keyword_param1=arg3)  
result3 = function_name(arg1, arg2, keyword_param2=arg4)

Note that the third line specifies a custom value for the keyword_param2 parameter, while the keyword_param1 parameter is omitted and will use its default value of None.