Python Functions and Modules Quiz

A user-defined function is created by the user to perform specific tasks, while a built-in function is pre-defined in Python and readily available for use. User-defined functions are customized by the user to meet specific requirements, whereas built-in functions are part of the Python programming language and provide general-purpose functionality.

Recursion is a programming technique where a function calls itself to solve a problem. An example of recursion in Python is the calculation of factorial using a recursive function. For example, the factorial of a number n, denoted as n!, can be calculated using the recursive function $factorial(n) = n imes factorial(n-1)$ with a base case of $factorial(0) = 1$.

In Python, parameters are used to define the input variables expected by a function, while arguments are the actual values passed to the function when it is called. For example, in the function definition def add(x, y):, x and y are parameters. When calling the function with add(3, 5), 3 and 5 are the arguments.

A user-defined module in Python is created by saving a Python file with a .py extension, which contains functions, classes, or variables that can be imported and used in other Python programs. To create a user-defined module, define the desired functions, classes, or variables in a .py file, and then import the module in other Python programs using the import statement.

# Function to display student information with default enrollment number

def student_info(name, address, contact_no, enrollment_no='00000'):
    print('Enrollment No.:', enrollment_no)
    print('Student’s Name:', name)
    print('Address:', address)
    print('Contact No.:', contact_no)

# Function call with default enrollment number
student_info('John Doe', '123 Main St', '123-456-7890')