Procedure Call Examples in Python

🧠 Quick Study Guide: Python Procedure Calls

• 🎯 Definition: In Python, procedures are typically referred to as functions. They are blocks of organized, reusable code that perform a single, related action.
• ⚙️ Defining a Function: Use the def keyword, followed by the function name, parentheses (), and a colon :. For example, def greet(name):.
• 📞 Calling a Function: To execute the code inside a function, you 'call' it by using its name followed by parentheses (). For example, greet("Alice").
• 🎁 Arguments & Parameters: Parameters are variables listed inside the parentheses in the function definition. Arguments are the actual values passed to the function when it's called.
• 🔢 Types of Arguments: Python supports positional arguments (order matters), keyword arguments (name matters), default arguments (pre-assigned values), and arbitrary arguments (*args for non-keyworded, kwargs for keyworded).
• ↩️ Return Values: Functions can optionally return a value using the return statement. If no return statement is present, or return is used without a value, the function implicitly returns None.
• 🚫 Procedures vs. Functions: While often used interchangeably, strictly speaking, a procedure performs an action without returning a value, whereas a function returns a value. In Python, all 'procedures' are technically functions, and they return None if no explicit return value is specified.

📝 Practice Quiz: Python Procedure Calls

1. What is the primary keyword used to define a function in Python?

   A) function

   B) define

   C) def

   D) proc

2. Consider the function def calculate_area(length, width): return length * width. Which of the following is a correct way to call this function using keyword arguments?

   A) calculate_area(5, 10)

   B) calculate_area(length=5, width=10)

   C) calculate_area(width=10, 5)

   D) calculate_area(5, width=10)

3. What will be the output of the following Python code?

   def say_hello():
       print("Hello!")
   result = say_hello()
   print(result)
   

   A) Hello! followed by Hello!

   B) Hello! followed by None

   C) None followed by Hello!

   D) An error

4. Which type of argument allows a function to accept an arbitrary number of non-keyworded arguments?

   A) Default arguments

   B) Keyword arguments

   C) *args

   D) kwargs

5. If a Python function is defined as def power(base, exponent=2): return base ** exponent, what will power(3) return?

   A) 9

   B) 6

   C) 27

   D) An error

6. Which of the following statements about Python functions is TRUE?

   A) All Python functions must explicitly return a value.

   B) Functions can only accept positional arguments.

   C) A function without an explicit return statement implicitly returns None.

   D) Function names must start with an uppercase letter.

7. Given the function definition def greet(name, message="Hello"): print(f"{message}, {name}!"), which call will print "Hi, Bob!"?

   A) greet("Bob")

   B) greet(name="Bob", message="Hi")

   C) greet("Bob", "Hi")

   D) Both B and C