PCEP-30-02 4.4 - Basics of Python E.txt

PCEP-30-02 4.4 - Basics of Python Exception Handling:

1. What is the purpose of a try-except block in Python?
   A) To define a function
   B) To create a loop
   C) To handle exceptions
   D) To import modules

2. Which keyword is used to specify the code that might raise an exception?
   A) catch
   B) try
   C) except
   D) finally

3. What happens if an exception occurs in a try block and there's no matching except block?
   A) The program continues execution
   B) The exception is ignored
   C) The program terminates with an error
   D) The exception is automatically handled

4. Which of the following is the correct syntax for a basic try-except block?
   A) try { } except { }
   B) try: ... except:
   C) try ... catch ...
   D) try() except()

5. What does the following code print if x is not defined?
   ```python
   try:
       print(x)
   except NameError:
       print("Variable x is not defined")
   ```
   A) Nothing
   B) Variable x is not defined
   C) NameError
   D) None of the above

6. How can you catch multiple exception types in a single except clause?
   A) except (TypeError, ValueError):
   B) except TypeError, ValueError:
   C) except [TypeError, ValueError]:
   D) except {TypeError, ValueError}:

7. What is the correct order for handling exceptions?
   A) Most specific to most general
   B) Most general to most specific
   C) The order doesn't matter
   D) Alphabetical order

8. Which of the following is true about the except clause without any specified exception?
   A) It catches all exceptions
   B) It's a syntax error
   C) It only catches built-in exceptions
   D) It doesn't catch any exceptions

9. What does the following code print if x is 0?
   ```python
   try:
       result = 10 / x
   except ZeroDivisionError:
       print("Cannot divide by zero")
   else:
       print("Result:", result)
   ```
   A) Result: 0
   B) Cannot divide by zero
   C) ZeroDivisionError
   D) Nothing

10. How can you access the details of the caught exception?
    A) Using the as keyword in the except clause
    B) Using the with keyword
    C) Exceptions don't have details
    D) Using the get_details() method

11. What is the purpose of the finally clause in a try-except block?
    A) To specify the main code to be executed
    B) To handle specific exceptions
    C) To execute code regardless of whether an exception occurred
    D) To raise custom exceptions

12. How do you propagate an exception to the calling function?
    A) Use the propagate keyword
    B) Re-raise the exception using raise
    C) Use the pass statement
    D) Exceptions are automatically propagated

13. What happens when an exception is not handled in a function?
    A) The program terminates
    B) The exception is ignored
    C) The exception propagates to the calling function
    D) A default exception handler is called

14. Which of the following is NOT a valid way to handle exceptions?
    A) try-except
    B) try-finally
    C) try-catch
    D) try-except-else

15. What does the following code print?
    ```python
    try:
        print(1/0)
    except:
        print("An error occurred")
    ```
    A) 1/0
    B) ZeroDivisionError
    C) An error occurred
    D) Nothing

16. How can you get the name of the exception that was raised?
    A) exception.name
    B) str(exception)
    C) type(exception).__name__
    D) exception.type()

17. What is the purpose of the else clause in a try-except block?
    A) To handle exceptions
    B) To execute if no exceptions were raised
    C) To always execute, regardless of exceptions
    D) To raise custom exceptions

18. Which statement is used to manually raise an exception?
    A) throw
    B) raise
    C) except
    D) error

19. What happens if an exception is raised in the except block?
    A) It's automatically caught
    B) The program terminates
    C) It propagates to the outer try-except block
    D) It's ignored

20. How can you catch all exceptions except for keyboard interrupts and system exits?
    A) except Exception:
    B) except BaseException:
    C) except:
    D) except *:

21. What is the correct way to define a custom exception?
    A) class MyException(Exception):
    B) def MyException(Exception):
    C) exception MyException:
    D) create exception MyException

22. Which of the following is true about exception handling in Python?
    A) It's optional and not recommended
    B) It's mandatory for all programs
    C) It helps make programs more robust
    D) It always slows down program execution

23. What does the following code print if x is not defined?
    ```python
    try:
        print(x)
    except NameError as e:
        print(type(e).__name__)
    ```
    A) x
    B) NameError
    C) Exception
    D) None

24. How can you handle an exception and still get its traceback?
    A) Use the traceback module
    B) Exceptions don't have tracebacks
    C) Use the sys.exc_info() function
    D) Both A and C

25. What is the purpose of delegating responsibility for handling exceptions?
    A) To improve code organization
    B) To handle exceptions at the appropriate level
    C) To simplify error handling logic
    D) All of the above

Answers:
1. C, 2. B, 3. C, 4. B, 5. B, 6. A, 7. A, 8. A, 9. B, 10. A, 11. C, 12. B, 13. C, 14. C, 15. C, 16. C, 17. B, 18. B, 19. C, 20. A, 21. A, 22. C, 23. B, 24. D, 25. D