PYTHON-LAB-IV-SEM

Understanding Different Kinds of Arguments: A Case Study

Introduction

In Python, functions can accept different kinds of arguments, including positional, keyword, default, and variable-length arguments. Let’s explore these types through a case study.

Case Study: Creating a Function to Greet Users

Problem Statement

We want to create a function that greets users with a customizable message.

Approach

We’ll define a function greetUser with various types of arguments:

• Positional Arguments: Name and message.
• Keyword Arguments: Name and message with default values.
• Variable-Length Arguments: Greeting multiple users at once.

Implementation

def greetUser(name, message):
    print(f"Hello, {name}! {message}")

def greetUserDefault(name="Guest", message="Welcome!"):
    print(f"Hello, {name}! {message}")

def greetUsers(*names, message="Welcome!"):
    for name in names:
        print(f"Hello, {name}! {message}")

greetUser("Akash", "Good morning!")  
greetUserDefault()  
greetUsers("Varun", "Rajesh", message="Have a nice day!")

Hello, Akash! Good morning!
Hello, Guest! Welcome!
Hello, Varun! Have a nice day!
Hello, Rajesh! Have a nice day!

Explanation

• Positional Arguments: greetUser function takes name and message as positional arguments. They’re passed in the order defined by the function.
• Keyword Arguments with Default Values: greetUserDefault function accepts name and message as keyword arguments with default values. They can be overridden during function call.
• Variable-Length Arguments: greetUsers function accepts a variable number of names using *names syntax. It also takes a keyword argument message with a default value.

Conclusion

Understanding different kinds of arguments in Python allows us to create versatile and flexible functions. Positional, keyword, default, and variable-length arguments provide various ways to pass data to functions, enhancing code readability and usability.