Welcome to the Python Exception Handling Python Interview Questions! Exception handling is a crucial aspect of programming that allows you to gracefully handle errors and unexpected situations in your code. In Python, exceptions are raised when an error occurs during program execution, and they can be caught and handled using try-except blocks. These questions will test your understanding of various aspects of exception handling in Python, including try-except blocks, specific exception types, raising exceptions, and best practices. Each question is multiple-choice, with only one correct answer. Take your time to carefully read each question and choose the best option. Let’s dive into the world of Python exception handling together!
30+ Python Interview Questions on Python Exception Handling
Q1. What is the purpose of the try block in Python error handling?
a) To define the block of code where an exception may occur
b) To catch and handle exceptions that occur within the block
c) To ensure that the code executes without any errors
d) To terminate the program if an exception occurs
Answer: a
Explanation: The try block defines a block of code in which exceptions may occur.
Q2. Which keyword is used to handle exceptions in Python?
a) try
b) catch
c) except
d) handle
Answer: c
Explanation: The except keyword is used in Python to handle exceptions.
Q3. What will happen if an exception is raised inside the try block and there is no corresponding except block to handle it?
a) The program will terminate
b) The exception will be ignored
c) The program will enter an infinite loop
d) The program will continue executing the code after the try-except block
Answer: a
Explanation: If an exception is raised inside a try block and there is no corresponding except block to handle it, the program will terminate.
Q4. Which of the following statements about exceptions in Python is true?
a) All exceptions are errors
b) Exceptions can only be handled with try-except blocks
c) Exceptions can be raised explicitly using the raise keyword
d) Exceptions can only occur in the main block of code
Answer: c
Explanation: Exceptions can be raised explicitly using the raise keyword in Python.
Q5. What is the purpose of the except block in Python exception handling?
a) To define the block of code where an exception may occur
b) To catch and handle exceptions that occur within the try block
c) To ensure that the code executes without any errors
d) To terminate the program if an exception occurs
Answer: b
Explanation: The except block catches and handles exceptions that occur within the try block.
Q6. Which of the following is a built-in exception in Python?
a) StopIteration
b) ExceptionalError
c) BreakException
d) ProgramHalt
Answer: a
Explanation: StopIteration is a built-in exception in Python used with iterators.
Q7. What will be the output of the following code?
try:
x = 10 / 0
except ZeroDivisionError:
print("Divide by zero error")
except:
print("Other error")
a) “Divide by zero error”
b) “Other error”
c) Nothing will be printed
d) Error: division by zero
Answer: a
Explanation: The code will output “Divide by zero error” because a ZeroDivisionError exception is raised.
Q8. What is the purpose of the finally block in Python exception handling?
a) To define the block of code where an exception may occur
b) To catch and handle exceptions that occur within the try block
c) To ensure that the code executes without any errors
d) To execute cleanup code, whether an exception occurs or not
Answer: d
Explanation: The finally block in Python executes cleanup code, whether an exception occurs or not.
Q9. What is the output of the following code?
try:
raise NameError("Custom error")
except NameError as e:
print(e)
a) “Custom error”
b) “NameError: Custom error”
c) “Error: Custom error”
d) NameError: Custom error
Answer: a
Explanation: The code will output “Custom error” because a NameError with the specified message is raised and caught.
Q10. Which of the following is NOT a standard Python exception type?
a) ValueError
b) KeyError
c) TypeMismatchError
d) IndexError
Answer: c
Explanation: TypeMismatchError is not a standard Python exception type.
Q11. What does the following code snippet do?
try:
x = int("abc")
except ValueError:
print("Invalid literal for int()")
finally:
print("Finally block executed")
a) Attempts to convert a string to an integer and prints an error message if it fails
b) Prints “Finally block executed” regardless of the outcome
c) Raises a ValueError exception
d) Terminates the program
Answer: b
Explanation: The finally block is always executed, regardless of whether an exception is raised or caught.
Q12. What will be the output of the following code?
try:
raise IndexError("Index out of range")
except ValueError:
print("ValueError")
except IndexError:
print("IndexError")
except Exception:
print("Exception")
a) “ValueError”
b) “IndexError”
c) “Exception”
d) “Index out of range”
Answer: b
Explanation: The code will output “IndexError” because an IndexError exception is raised and caught.
Q13. What is the purpose of the raise statement in Python?
a) To handle exceptions
b) To terminate the program
c) To define a new exception
d) To print an error message
Answer: c
Explanation: The raise statement is used to explicitly raise exceptions in Python.
Q14. What will happen if an exception is raised but not caught in a Python program?
a) The program will continue executing normally
b) The program will terminate with an error message
c) The program will pause and wait for user input
d) The program will enter an infinite loop
Answer: b
Explanation: If an exception is raised but not caught, the program will terminate with an error message.
Q15. Which of the following keywords is used to catch all exceptions in Python?
a) try
b) catch
c) except
d) finally
Answer: c
Explanation: The except keyword is used to catch all exceptions in Python.
Q16. What is the output of the following code?
try:
x = 10 / 0
except ZeroDivisionError:
print("Divide by zero error")
finally:
print("Finally block executed")
a) “Divide by zero error”
b) “Finally block executed”
c) “Divide by zero error” followed by “Finally block executed”
d) Nothing will be printed
Answer: c
Explanation: The code will output “Divide by zero error” because a ZeroDivisionError exception is raised and caught, followed by “Finally block executed”.
Q17. What will be the output of the following code?
try:
x = int(input("Enter a number: "))
except ValueError:
print("Invalid input")
else:
print("You entered:", x)
a) “Invalid input”
b) “You entered: <number>”
c) Nothing will be printed
d) Error: invalid literal for int() with base 10: ‘<input>’
Answer: b
Explanation: If the input is successfully converted to an integer, it will print “You entered: <number>”. Otherwise, it will print “Invalid input”.
Q18. Which of the following is true about the else block in Python exception handling?
a) The else block is executed if an exception occurs
b) The else block is always executed after the except block
c) The else block is executed if no exceptions occur in the try block
d) The else block is optional in exception handling
Answer: c
Explanation: The else block is executed if no exceptions occur in the try block.
Q19. What does the following code snippet do?
try:
assert 5 > 10, "AssertionError"
except AssertionError as e:
print(e)
finally:
print("Finally block executed")
a) Raises an AssertionError and prints “AssertionError”, followed by “Finally block executed”
b) Raises an AssertionError and prints “False”, followed by “Finally block executed”
c) Raises an AssertionError and prints “5 > 10”, followed by “Finally block executed”
d) Raises no error and prints “Finally block executed”
Answer: a
Explanation: The code will raise an AssertionError due to the failed assertion, and it will print the custom error message “AssertionError”, followed by “Finally block executed”.
Q20. What is the output of the following code?
try:
assert 2 + 2 == 5, "AssertionError"
except AssertionError as e:
print(e)
a) AssertionError
b) AssertionError: 2 + 2 == 5
c) 4
d) Nothing will be printed
Answer: a
Explanation: The code will output “AssertionError” because the assert statement fails.
Q21. Which of the following is a built-in exception type in Python?
a) ProgramError
b) SystemError
c) ExecutionError
d) LogicalError
Answer: b
Explanation: SystemError is a built-in exception type in Python.
Q22. What will happen if an exception is raised but not caught within a function?
a) The function will return None
b) The function will return the exception object
c) The program will terminate
d) The program will enter an infinite loop
Answer: c
Explanation: If an exception is raised but not caught within a function, the program will terminate.
Q23. What is the purpose of the traceback in Python exception handling?
a) To display the error message
b) To display the line number where the exception occurred
c) To print the stack trace of the program
d) To terminate the program
Answer: c
Explanation: The traceback in Python exception handling is used to print the stack trace of the program, showing the line numbers and functions involved.
Q24. What is the output of the following code?
try:
raise TypeError("Type error occurred")
except Exception as e:
print(e.__class__.__name__)
a) “TypeError”
b) “Exception”
c) “Error”
d) “Python”
Answer: a
Explanation: The code will output “TypeError” because a TypeError exception is raised and caught, and e.__class__.__name__ retrieves the name of the exception class.
Q25. Which of the following is NOT a standard Python exception type?
a) OverflowError
b) SyntaxError
c) RangeError
d) KeyError
Answer: c
Explanation: RangeError is not a standard Python exception type.
Q26. What does the following code snippet do?
try:
x = int(input("Enter a number: "))
y = int(input("Enter another number: "))
result = x / y
except ValueError:
print("Invalid input")
except ZeroDivisionError:
print("Cannot divide by zero")
else:
print("Result:", result)
finally:
print("End of program")
a) Asks the user to enter two numbers, divides them, and prints the result
b) Asks the user to enter two numbers and prints their sum
c) Prints “Invalid input” if the user enters a non-integer value
d) Prints “Cannot divide by zero” if the user enters zero as the second number
Answer: a
Explanation: The code asks the user to enter two numbers, divides them, and prints the result. It also handles exceptions for invalid input and zero division.
Q27. What will be the output of the following code?
try:
x = 5 / 0
except:
print("An error occurred")
else:
print("No error")
finally:
print("Finally block executed")
a) “An error occurred” followed by “Finally block executed”
b) “No error” followed by “Finally block executed”
c) “An error occurred”
d) “No error”
Answer: a
Explanation: The code will output “An error occurred” because a ZeroDivisionError exception is raised, followed by “Finally block executed”.
Q28. What is the purpose of the assert statement in Python?
a) To handle exceptions
b) To terminate the program
c) To define a new exception
d) To check for conditions that should be true during program execution
Answer: d
Explanation: The assert statement is used to check for conditions that should be true during program execution. If the condition is false, an AssertionError is raised.
Q29. What will be the output of the following code?
try:
assert 3 < 2, "AssertionError"
except AssertionError as e:
print(e)
finally:
print("Finally block executed")
a) “AssertionError”
b) “AssertionError: AssertionError”
c) “3 < 2”
d) “Finally block executed”
Answer: a
Explanation: The code will output “AssertionError” because the assert statement fails, and the custom error message is printed.
Q30. Which of the following is a valid reason to use custom exceptions in Python?
a) To replace built-in exceptions
b) To handle unexpected errors
c) To confuse the programmer
d) To reduce code readability
Answer: b
Explanation: A valid reason to use custom exceptions in Python is to handle unexpected errors and provide meaningful error messages.
Q31. What will be the output of the following code?
try:
x = int("abc")
except ValueError:
print("Invalid input")
except Exception as e:
print(e)
else:
print("No error")
finally:
print("Finally block executed")
a) “Invalid input” followed by “Finally block executed”
b) “invalid literal for int() with base 10: ‘abc'” followed by “Finally block executed”
c) “No error” followed by “Finally block executed”
d) “Finally block executed” only
Answer: b
Explanation: The code will output “invalid literal for int() with base 10: ‘abc'” because a ValueError occurs when trying to convert “abc” to an integer, followed by “Finally block executed”.
Q32. What is the output of the following code?
try:
raise KeyError("Key not found")
except ValueError:
print("ValueError")
except KeyError as e:
print(e)
a) “ValueError”
b) “KeyError: Key not found”
c) “Key not found”
d) Nothing will be printed
Answer: b
Explanation: The code will output “KeyError: Key not found” because a KeyError with the specified message is raised and caught.
Congratulations on completing the Python Exception Handling MCQs! Exception handling is a critical skill for writing robust and error-tolerant code in Python. By mastering exception handling techniques, you gain the ability to gracefully handle errors, prevent program crashes, and improve the overall reliability of your code. Keep practicing and experimenting with different scenarios to become proficient in using try-except blocks, handling specific exception types, and raising custom exceptions. If you have any questions or want to delve deeper into any topic, don’t hesitate to continue your learning journey. Happy coding!
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