Python User Defined Functions

What is the syntax for defining a user defined function in Python?

• def function_name(parameters):

• function_name(parameters)

• function_name:

• function_name(parameters):

Answer explanation

The correct syntax for defining a user defined function in Python is 'def function_name(parameters):'

How do you pass parameters to a user defined function in Python?

• By declaring the parameters outside of the function definition

• By using the 'print' statement

• By using the 'return' keyword

• By specifying the parameter names within the parentheses of the function definition.

Answer explanation

The correct way to pass parameters to a user defined function in Python is by specifying the parameter names within the parentheses of the function definition.

What keyword is used to return a value from a user defined function in Python?

• return

• output

• response

• result

Answer explanation

The keyword 'return' is used to return a value from a user defined function in Python.

Can a user defined function call itself in Python? If yes, what is it called?

• iteration

• reiteration

• recursion

• repetition

Answer explanation

Yes, a user defined function can call itself in Python, and it is called recursion.

Write a code example of a simple user defined function in Python.

• def subtract_numbers(num1, num2):

• def add_numbers(num1, num2):

• def multiply_numbers(num1, num2):

• def greet(name): print('Hello, ' + name)

Answer explanation

The correct answer is def greet(name): print('Hello, ' + name) because it is a simple user defined function that takes a name as input and prints a greeting message.

What is the purpose of the 'return' statement in a user defined function?

• The purpose of the 'return' statement in a user defined function is to exit the function and return a value to the caller.

• The purpose of the 'return' statement in a user defined function is to skip to the next line of code.

• The purpose of the 'return' statement in a user defined function is to print a message to the console.

• The purpose of the 'return' statement in a user defined function is to pause the function execution.

Answer explanation

The purpose of the 'return' statement in a user defined function is to exit the function and return a value to the caller.

Explain the concept of recursion in user defined functions with an example in Python.

• Recursion in Python can only be used with built-in functions, not user-defined functions

• An example of recursion in Python is the calculation of the sum of a list using a recursive function

• Recursion in Python is used for creating loops within a function

• An example of recursion in Python is the calculation of factorial of a number using a recursive function. For example, the factorial of 5 (denoted as 5!) can be calculated using a recursive function like this: def factorial(n): if n == 0 or n == 1: return 1 else: return n * factorial(n-1)

Answer explanation

Recursion in Python is exemplified by the calculation of factorial using a recursive function, as shown in the correct answer.

How do you define a function that takes a variable number of arguments in Python?

• Use *args and **kwargs parameters to define a function that takes a fixed number of arguments in Python.

• Use *args and **kwargs parameters to define a function that takes a variable number of arguments in Python.

• Use *args and **params parameters to define a function that takes a variable number of arguments in Python.

• Use *params and **args parameters to define a function that takes a variable number of arguments in Python.

Answer explanation

Use *args and **kwargs parameters to define a function that takes a variable number of arguments in Python.

What is the difference between parameters and arguments in a user defined function?

• Parameters are used in the function call, while arguments are used in the function definition.

• Parameters are used in the function definition, while arguments are the actual values passed to the function when it is called.

• Parameters are only used in built-in functions, while arguments are only used in user defined functions.

• Parameters and arguments are interchangeable and can be used in place of each other.

Answer explanation

Parameters are used in the function definition, while arguments are the actual values passed to the function when it is called.

Write a code example of a user defined function that takes two parameters and returns their sum in Python.

• def sum(a): return a + b

• def total(a, b): return a + a

• def add(b, aa): return a +b

• def sum_of_two_numbers(a, b): return a + b

Answer explanation

The correct answer is 'def sum_of_two_numbers(a, b): return a + b' because it defines a function that takes two parameters and returns their sum.