Defining Functions

Learning Objectives Define functions with type hints to improve code clarity and prevent bugs. Implement functions with default arguments to create more flexible and optional parameters. Differentiate between positional and keyword arguments and use them effectively in function calls. Construct functions that accept a variable number of positional arguments using *args. Build functions that accept a variable number of keyword arguments using **kwargs. Write comprehensive docstrings to document a function's purpose, parameters, and return value. Ever wondered how a command like `print()` can accept one item, or many, or even special instructions like `sep='-'`? 🤔 Let's unlock the secrets to building such powerful and flexible functions ourselves! In this...

TermDefinitionExample Type HintingA formal way to indicate the expected data type of a function's parameters and its return value. They act as 'hints' for developers and tools but do not enforce type checking at runtime.def greet(name: str) -> str: return f'Hello, {name}' Default ArgumentA parameter that is assigned a default value in the function definition. If a value is not provided for this parameter when the function is called, the default value is used.def power(base, exponent=2): return base ** exponent power(3) # returns 9 power(3, 3) # returns 27 Positional ArgumentAn argument passed to a function based on its position or order in the function call. The first argument corresponds to the first parameter, the second to the second, and so on.def subt...

Function Signature Syntax def function_name(pos_param, default_param=value, *args, **kwargs) -> return_type: This is the standard order for defining complex functions. Positional parameters come first, followed by parameters with default values, then *args, and finally **kwargs. Type hints for parameters and the return value (`-> return_type`) are included for clarity. Argument Passing Order function_call(positional_args, keyword_args) When calling a function, you must provide all positional arguments first, before any keyword arguments. Attempting to place a positional argument after a keyword argument will result in a SyntaxError.