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PCEP Certification Practice: Delegating Responsibility for Handling Exceptions

PCEP Certification Practice Test - Questions, Answers and Explanations

Following questions cover the topic of delegating responsibility for handling exceptions in Python, focusing on how exceptions propagate through functions and how responsibility for handling them can be passed to other parts of the program.

Question 1: What does it mean to "delegate responsibility for handling exceptions" in Python?

  1. Catching every exception inside the same function where it occurs.
  2. Allowing exceptions to propagate to another function or caller to handle them.
  3. Using only the finally block to handle exceptions.
  4. Raising new exceptions within the same function.

Answer: B) Allowing exceptions to propagate to another function or caller to handle them.

Explanation: Delegating responsibility for handling exceptions means allowing exceptions to propagate to other functions or parts of the program where they can be handled, rather than catching them in the function where they occur.

Question 2: Which of the following are valid ways to delegate responsibility for handling exceptions in Python? (Select all that apply.)

  • Let the exception propagate to the calling function.
  • Re-raise an exception within a function to pass it to another handler.
  • Handle all exceptions within the function where they occur.
  • Use try-except blocks in the calling code to catch exceptions raised in functions.

Answer: A) Let the exception propagate to the calling function.
B) Re-raise an exception within a function to pass it to another handler.
D) Use try-except blocks in the calling code to catch exceptions raised in functions.

Explanation: Responsibility for handling exceptions can be delegated by letting exceptions propagate to the calling function, re-raising exceptions, or catching exceptions in the calling code.

Question 3: In Python, exceptions can propagate to the _________ function, which can handle them if not caught inside the function where they occur.

  1. main
  2. calling
  3. except

Answer: B) calling

Explanation: If an exception is not caught in a function, it propagates to the calling function, which can handle it using a try-except block.

Question 4: If a function raises an exception and does not handle it, the responsibility for handling that exception is delegated to the __________ function.

Answer: calling

Explanation: When an exception is raised in a function and not caught, it propagates to the calling function, which becomes responsible for handling the exception.

Question 5: Fill in the blank to delegate the responsibility of handling the ValueError to the calling function:

def convert_to_int(s):
    return int(s)

try:
    convert_to_int("abc")
except __________:
    print("Invalid value provided!")

Answer: except ValueError:

Explanation: The convert_to_int() function raises a ValueError, but it does not handle the exception. The calling code is responsible for handling the exception using a try-except block.

Question 6: What happens if a function does not catch an exception, and the calling function does not handle it either?

  1. The program terminates.
  2. The exception is re-raised automatically.
  3. The exception is ignored.
  4. The program enters an infinite loop.

Answer: A) The program terminates.

Explanation: If neither the function nor the calling function handles an exception, the exception propagates up the call stack, and if it remains uncaught, the program terminates.

Question 7: Insert the correct code to delegate the handling of the ZeroDivisionError to the calling function:

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

try:
    divide(10, 0)
# INSERT CODE HERE
    print("Division by zero error!")

Answer: except ZeroDivisionError:

Explanation: The divide() function raises a ZeroDivisionError, which is not handled within the function. The calling code catches the exception and handles it.

Question 8: Which of the following statements are true about delegating exception handling in Python? (Select all that apply.)

  1. A function can let exceptions propagate to the caller without handling them.
  2. The calling function must always handle exceptions.
  3. Re-raising an exception in a function delegates responsibility to the caller.
  4. Exceptions must always be handled within the same function where they occur.

Answer: A) A function can let exceptions propagate to the caller without handling them.
C) Re-raising an exception in a function delegates responsibility to the caller.

Explanation: A function can allow exceptions to propagate to the calling function, where they can be handled. Re-raising an exception in a function also delegates responsibility to the caller.

Question 9: When a function raises an exception and does not handle it, responsibility for handling the exception is passed to the _________ function.

  • nested
  • calling
  • outer

Answer: B) calling

Explanation: If an exception is not caught within a function, it is passed to the calling function, which becomes responsible for handling the exception.

Question 10: If a function raises an exception and does not catch it, responsibility for handling the exception is passed to the __________.

Answer: calling

Explanation: When a function raises an exception without catching it, the caller (the function that invoked it) is responsible for handling the exception.

Question 11: Sort the following actions in the correct order when delegating exception handling in Python.

  1. An exception occurs in a function.
  2. The calling function catches the exception.
  3. The exception propagates to the calling function.

Answer: A) An exception occurs in a function.
C) The exception propagates to the calling function.
B) The calling function catches the exception.

Explanation: When an exception occurs in a function, it propagates to the calling function, which may catch and handle the exception.

Question 12: Which of the following practices are examples of delegating responsibility for handling exceptions? (Select all that apply.)

  1. Raising an exception in a function and catching it in the calling function.
  2. Re-raising an exception in a function so that it can be caught by a higher-level handler.
  3. Using try-except inside every function to handle exceptions locally.
  4. Allowing the exception to propagate to a global handler.

Answer: A) Raising an exception in a function and catching it in the calling function.
B) Re-raising an exception in a function so that it can be caught by a higher-level handler.
D) Allowing the exception to propagate to a global handler.

Explanation: Delegating responsibility for handling exceptions involves allowing exceptions to propagate to higher-level functions or global handlers, rather than catching them locally in every function.

Question 13: The responsibility for handling an exception can be delegated to the _________ function if it is not handled locally in the function where it occurs.

  1. next
  2. main
  3. calling

Answer: C) calling

Explanation: Responsibility for handling an exception is delegated to the calling function if the exception is not handled in the function where it occurs.

Question 14: If a function raises an exception and does not handle it, the exception will propagate to the __________ function.

Answer: calling

Explanation: When an exception is raised and not caught, it propagates to the calling function, where it can be handled.

Question 15: Fill in the blank to delegate responsibility for handling exceptions to the calling function:

def calculate_area(radius):
    if radius < 0:
        raise ValueError("Radius cannot be negative")
    return 3.14 * radius ** 2

try:
    calculate_area(-5)
except __________:
    print("Invalid radius provided!")

Answer: except ValueError:

Explanation: The calculate_area() function raises a ValueError when given a negative radius, but does not catch it. The calling code is responsible for catching the exception.

Question 16: What happens if a function raises an exception, but it is not caught in the calling function?

  1. The program terminates.
  2. The exception propagates further.
  3. The function automatically returns None.
  4. The program ignores the exception.

Answer: B) The exception propagates further.

Explanation: If an exception is not caught in the calling function, it continues propagating through the call stack until it is caught or the program terminates.

Question 17: Insert the correct code to delegate responsibility for handling an exception from one function to another:

def func1():
    raise KeyError("Key not found")

def func2():
    try:
        func1()
# INSERT CODE HERE to handle the exception
        print("KeyError handled")

func2()

Answer: except KeyError:

Explanation: The KeyError raised in func1() is delegated to func2(), where it is caught and handled by the except KeyError block.

Question 18: Which of the following are examples of delegating exception handling responsibility to other functions? (Select all that apply.)

  1. Re-raising an exception after catching it.
  2. Letting an exception propagate to the calling function.
  3. Handling the exception inside the function where it occurs.
  4. Allowing the exception to propagate to a global handler.

Answer: A) Re-raising an exception after catching it.
B) Letting an exception propagate to the calling function.
D) Allowing the exception to propagate to a global handler.

Explanation: Delegating exception handling means allowing the exception to propagate to another function, re-raising it, or letting it be handled by a global handler.

Question 19: In Python, an exception that is raised but not caught in a function will propagate to the _________.

  1. next line
  2. calling function
  3. global scope

Answer: B) calling function

Explanation: An exception that is not caught in a function will propagate to the calling function, where it can be handled.

Question 20: If a function raises an exception but does not catch it, the __________ function is responsible for handling the exception.

Answer: calling

Explanation: When a function raises an exception and does not catch it, the responsibility for handling the exception is delegated to the calling function.

Question 21: Arrange the following actions in the correct order when handling exceptions in a delegated fashion.

  1. A function raises an exception.
  2. The exception is propagated to the calling function.
  3. The calling function catches the exception.

Answer: A) A function raises an exception.
2. B) The exception is propagated to the calling function.
3. C) The calling function catches the exception.

Explanation: When an exception is raised in a function, it propagates to the calling function, which can catch and handle it.

Question 22: Which of the following are valid strategies for handling exceptions by delegating responsibility in Python? (Select all that apply.)

  1. Re-raising exceptions after catching them.
  2. Handling all exceptions inside each function locally.
  3. Allowing exceptions to propagate to higher-level functions.
  4. Letting a global exception handler catch unhandled exceptions.

Answer: A) Re-raising exceptions after catching them.
C) Allowing exceptions to propagate to higher-level functions.
D) Letting a global exception handler catch unhandled exceptions.

Explanation: Delegating responsibility for handling exceptions can be done by re-raising exceptions, allowing them to propagate to higher-level functions, or letting a global handler catch unhandled exceptions.

Question 23: In Python, an exception raised in a function will propagate to the _________ function if it is not caught.

  1. next
  2. previous
  3. calling

Answer: C) calling

Explanation: If an exception is not caught in a function, it will propagate to the calling function, which can handle the exception.

Question 24: Fill in the blank to delegate responsibility for handling exceptions to a higher-level function:

def check_positive(value):
    if value < 0:
        raise ValueError("Negative value provided")

try:
    check_positive(-10)
except __________:
    print("Caught a ValueError")

Answer: except ValueError:

Explanation: The check_positive() function raises a ValueError for negative values, and the calling code catches and handles this exception.

Question 25: What happens when an exception is not caught by the calling function?

  1. The exception propagates further up the call chain.
  2. The exception is re-raised by the called function.
  3. The program automatically handles the exception.
  4. The function returns None.

Answer: A) The exception propagates further up the call chain.

Explanation: If an exception is not caught by the calling function, it continues propagating up the call chain until it is caught or the program terminates.



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