Module 10: Defining functions

4.1.1 Define and invoke user-defined functions

• Explain how functions support code decomposition, reuse, and maintainability.
• Define a function using the def keyword.
• Create valid function names according to Python naming rules.
• Define a function body using correct indentation.
• Invoke a user-defined function.
• Trace the order in which function definitions and function calls are executed.

4.1.2 Return values from functions

• Use the return statement to return a result from a function.
• Assign a returned value to a variable.
• Use returned values in expressions and function calls.
• Explain the difference between returning a value and displaying a value with print().
• Explain how return terminates the current function call.
• Return multiple values from a function.
• Recognize when a function implicitly returns None.
• Use the None value to represent the absence of a meaningful result.

4.1.3 Define parameters and pass arguments to functions

• Distinguish between parameters in function definitions and arguments in function calls.
• Pass arguments by position and keyword, and combine them in the correct order.
• Define parameters with default values.
• Call functions using default values or override them with explicit arguments.
• Use keyword arguments with built-in functions such as print(), including sep and end.
• Recognize invalid function calls caused by missing, duplicated, or incorrectly ordered arguments.