PCEP Certification Practice Test: User-Defined Functions and Generators

Question 1: What is the correct syntax for defining a user-defined function in Python?

1. def my_function:
2. def my_function():
3. def my_function:()
4. my_function()

Question 2: Which of the following are true about Python functions? (Choose all that apply)

1. Functions can return a value using the return statement.
2. Functions can take arguments as input.
3. Functions must always return a value.
4. Functions can be invoked without any arguments.

Question 3: Complete the code to define a function greet that prints "Hello, World!".

def greet():
    ______ "Hello, World!"

Question 4: What will be the output of the following code?

def add(a, b):
    return a + b

result = add(3, 4)
print(result)

1. 7
2. 34
3. Error
4. None

Question 5: Insert the correct code to call the function greet and display "Hello".

def greet():
    print("Hello")

______

Question 6: What will the following code return?

def square(x):
    return x ** 2

result = square(5)
print(result)

1. 10
2. 25
3. 5
4. None

Question 7: Which of the following are valid ways to define a function in Python? (Choose all that apply)

1. def my_function(): pass
2. def my_function():
3. def my_function(a, b): return a + b
4. def my_function(): print("Hello")

Question 8: Arrange the steps to correctly define and call a function that multiplies two numbers.

1. Print the result.
2. Define the function multiply().
3. Return the product of two numbers.
4. Call the multiply() function with two arguments.

Question 9: Complete the code to define a function divide that returns the division of two numbers a and b.

def divide(a, b):
    ______ a / b

Question 10: What will be the output of the following code?

def say_hello(name):
    return f"Hello, {name}!"

message = say_hello("Alice")
print(message)

1. Hello, name!
2. Hello, Alice!
3. name
4. Alice

Question 11: Insert the correct code to define and call a generator function count_up_to that yields numbers from 1 to n.

def count_up_to(n):
    for i in range(1, n+1):
        ______ i

gen = count_up_to(5)
print(list(gen))

Question 12: Which of the following correctly defines a generator function in Python?

1. def gen(): return 1
2. def gen(): yield 1
3. def gen(): return yield 1
4. def gen(): return

Question 13: Which of the following are characteristics of a generator function? (Choose all that apply)

1. Uses the yield keyword.
2. Returns a generator object.
3. Can only return one value.
4. Produces values one at a time

Question 14: Arrange the steps to correctly define and call a generator function that yields even numbers up to n.

1. Yield each even number.
2. Define the generator function even_numbers().
3. Use a loop to generate even numbers.
4. Call the generator function and print the results.

Question 15: Complete the code to define a function sum_numbers that returns the sum of two numbers x and y.

def sum_numbers(x, y):
    ______ x + y

Question 16: What will be the output of the following code?

def generator_example():
    yield "First"
    yield "Second"
    yield "Third"

gen = generator_example()
print(next(gen))
print(next(gen))

1. First Second
2. First Third
3. Second Third
4. Error

17. Insert the correct code to define a function multiply that multiplies two numbers and returns the result.

def multiply(x, y):
    ______ x * y

result = multiply(3, 4)
print(result)

Question 18: Which of the following statements correctly describes a generator?

1. A generator produces all values at once.
2. A generator produces values one at a time.
3. A generator must return a list.
4. A generator is called like a regular function.

Question 19: Which of the following are valid ways to invoke a user-defined function? (Choose all that apply)

• my_function()
• my_function(1, 2)
• my_function(a=10, b=20)
• def my_function()

Question 20: Arrange the steps to correctly define and invoke a function that subtracts two numbers.

1. Print the result.
2. Define the function subtract().
3. Use the return statement to return the result of a - b.
4. Call the function with arguments.

Question 21: Complete the code to define and invoke a function greet_user that takes a name as an argument and prints a greeting.

def greet_user(name):
    print("Hello, " + name)

greet_user(______)

Question 22: What will be the output of the following code?

def print_numbers(n):
    for i in range(1, n+1):
        print(i)

print_numbers(3)

1. 1 2 3
2. 1 2
3. 1 2 3 4
4. None

Question 23: Insert the correct code to define a generator count_down that counts down from n to 1.

def count_down(n):
    while n > 0:
        ______ n
        n -= 1

gen = count_down(3)
print(list(gen))

Question 24: What will be the result of the following code?

def add(a, b):
    return a + b

print(add(2, 3))

1. 2
2. 3
3. 5
4. Error

Question 25: Which of the following statements about generators are true? (Choose all that apply)

1. Generators use the yield keyword.
2. Generators return all values at once.
3. Generators return values one at a time.
4. Generators can be iterated using next().