Q: Question 1What all can be the possible outputs of the following code?def myfunc (x=None) : result = "" if x is None: result = "No argument given" elif x == 0: result = "Zero" elif 0 < x <= 3: result = "x is between 0 and 3" else: result = "x is more than 3" return result c = myfunc (3.5) print (c)

The incorrect indentation of the print statement will cause an indentation error when the code is executed.ExplanationThe corrected code is as follows:def myfunc(x = None) : result = "" if x is None: result = "No argument given" elif x == 0: result = "Zero" elif 0 < x <= 3: result = "x is between 0 and 3" else: result = "x is more than 3" return result c = myfunc(3.5) print(c)Outputx is more than 3 Working of the code:The code defines a function myfunc that takes an argument x, which defaults to None. Inside the function, it checks the value of x using a series of if-elif-else conditions. If x is None, it sets the result to "No argument given." If x is 0, it sets the result to "Zero." If x is greater than 0 but less than or equal to 3, it sets the result to "x is between 0 and 3." Otherwise, if x is greater than 3, it sets the result to "x is more than 3." The function then returns the result. In the provided code, the function is called with the argument 3.5, which falls into the last else condition, resulting in the output "x is more than 3" being stored in variable c and printed.

Q: Question 5How can you handle an exception in Python? Write sample code to illustrate it.

In Python, we can handle exceptions using the try-except block. It includes the following steps:Firstly, the moment an error occurs the state of execution of the program is saved.Normal flow of the program is interrupted.A special function or piece of code known as exception handler is executed.Execution of the program is resumed with the previously saved data.Here's an example of how to handle an exception:def divide_numbers(x, y): try: result = x / y except ZeroDivisionError: print("Error: Division by zero is not allowed.") else: print("Division result:", result) finally: print("End of division operation.") divide_numbers(10, 2) divide_numbers(10, 0) OutputDivision result: 5.0 End of division operation. Error: Division by zero is not allowed. End of division operation. This Python code defines a function divide_numbers that performs division between two numbers x and y. It uses a try-except block to handle exceptions that may arise during division, specifically the ZeroDivisionError. If a division by zero occurs, the program prints an error message indicating that division by zero is not allowed. Otherwise, if the division operation succeeds without any exceptions, it prints the result of the division. The finally block is executed in both cases, indicating the end of the division operation.

Q: Question 6Name some common built-in exceptions in Python.

Some common built-in exceptions in Python are NameError, TypeError, ValueError, ZeroDivisionError, AttributeError, KeyError, IndentationError, IOError, IndexError, EOFError, SyntaxError and RuntimeError.

Q: Question 7What does the finally clause produce in a try...except block?

The 'finally' clause in a 'try-except' block is executed regardless of whether an exception occurs in the 'try' block or not. Its primary purpose is to ensure that certain actions or cleanup operations are performed, before the program exits or moves on to the next code block.

Q: Question 9Differentiate between IOError and IndexError.

IOErrorIndexErrorThis error is raised if the file requested cannot be opened, or failure of I/O operation.This error is raised when an index is not found in a sequence, i.e., out of range or out of bounds.Examples of situations that can raise an IOError include: Opening a non-existent file for reading or writing, trying to read from a file that has been closed.Examples of situations that can raise an IndexError include: Accessing an index that is beyond the length of a list or tuple, trying to access a character in a string at an index that is outside the valid range of indices, using a negative index that is too large for the sequence.

Q: Question 10Show how to modify the following code so that an error is printed if the number conversion is not successful:val = input("Enter a number") pval = int(val)

val = input("Enter a number: ") try: pval = int(val) except ValueError: print("Error: Conversion to integer failed.")OutputEnter a number: 23 Enter a number: python Error: Conversion to integer failed. ExplanationIn this modified code the input function prompts the user to enter a number. The try block attempts to convert the input value to an integer using int(val). If the conversion is successful, pval will hold the integer value. If the conversion raises a ValueError (e.g., if the input is not a valid integer), the program jumps to the except block and prints an error message indicating that the conversion to an integer failed.

Q: Question 11Consider the code given below and fill in the blanks with appropriate error types:loop = 1 while loop == 1: try: a = int(input('Enter the first number: ') b = int(input('Enter the second number: ') quotient = a/b except ...............: print("Error: Please enter only numbers") except ...............: print("\n Error: Second number should not be zero") except ...............: print("\n Unsupported operation: Check the date type") else: print("Great") finally: print("Program execution completed") loop = int(input('Press 1 to try again !') continue

loop = 1 while loop == 1: try: a = int(input('Enter the first number: ')) b = int(input('Enter the second number: ')) quotient = a / b except ValueError: print("Error: Please enter only numbers") except ZeroDivisionError: print("\n Error: Second number should not be zero") except TypeError: print("\n Unsupported operation: Check the data type") else: print("Great") finally: print("Program execution completed") loop = int(input('Press 1 to try again: ')) continueIn the code:The ValueError exception is used to catch errors that occur when the input cannot be converted to an integer (e.g., if the user enters a non-numeric value).The ZeroDivisionError exception is used to catch errors that occur when attempting to divide by zero (i.e., when the second number is zero).The TypeError exception is used to catch errors related to unsupported operations, such as performing arithmetic operations on incompatible data types.

Q: Question 4The order of exception handling in Python is try, followed by except, and then finally.

TrueReason — The order of exception handling in Python is as follows: first, the try block contains the code that may raise an exception. Then, the except block is used to handle specific types of exceptions that may occur within the try block. Finally, the finally block, if present, is executed whether an exception is raised or not.

Question 1

Question 2Assertion (A): Exception handling code is separate from normal code.Reasoning (R): Program logic is different while exception handling code uses specific keywords to handle exceptions.Both A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Accepted Answer

Both A and R are true and R is the correct explanation of A.ExplanationException handling code is separate from normal code in programming languages. Exception handling code uses specific constructs like try, except, finally (in Python). Exception handling involves a different flow of control compared to regular program logic. When an exception occurs, the program jumps to the corresponding exception handling block (such as the except block in Python) rather than following the normal sequence of statements.

Question 2

Question 3Assertion (A): Exception handling code is clear and block based in Python.Reasoning (R): The code where unexpected runtime exception may occur is separate from the code where the action takes place when an exception occurs.Both A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Accepted Answer

Both A and R are true and R is the correct explanation of A.ExplanationIn Python, the structure of exception handling using clear and distinct blocks like try, except, and finally helps in organizing code. It separates the code where exceptions might occur (within the try block) from the code responsible for handling those exceptions (within the except and finally blocks).

Question 3

Question 1What all can be the possible outputs of the following code?def myfunc (x=None) :
    result = "" 
    if x is None:
       result = "No argument given"
    elif x == 0: 
       result = "Zero"
    elif 0 < x <= 3:
       result = "x is between 0 and 3"
    else:
       result = "x is more than 3"
    return result 
c = myfunc (3.5) 
    print (c)

Accepted Answer

The incorrect indentation of the print statement will cause an indentation error when the code is executed.ExplanationThe corrected code is as follows:def myfunc(x = None) :
    result = "" 
    if x is None:
       result = "No argument given"
    elif x == 0: 
       result = "Zero"
    elif 0 < x <= 3:
       result = "x is between 0 and 3"
    else:
       result = "x is more than 3"
    return result 
c = myfunc(3.5) 
print(c)Outputx is more than 3
Working of the code:The code defines a function myfunc that takes an argument x, which defaults to None. Inside the function, it checks the value of x using a series of if-elif-else conditions. If x is None, it sets the result to "No argument given." If x is 0, it sets the result to "Zero." If x is greater than 0 but less than or equal to 3, it sets the result to "x is between 0 and 3." Otherwise, if x is greater than 3, it sets the result to "x is more than 3." The function then returns the result. In the provided code, the function is called with the argument 3.5, which falls into the last else condition, resulting in the output "x is more than 3" being stored in variable c and printed.

Question 4

Question 5How can you handle an exception in Python? Write sample code to illustrate it.

Accepted Answer

In Python, we can handle exceptions using the try-except block. It includes the following steps:Firstly, the moment an error occurs the state of execution of the program is saved.Normal flow of the program is interrupted.A special function or piece of code known as exception handler is executed.Execution of the program is resumed with the previously saved data.Here's an example of how to handle an exception:def divide_numbers(x, y):
    try:
        result = x / y
    except ZeroDivisionError:
        print("Error: Division by zero is not allowed.")
    else:
        print("Division result:", result)
    finally:
        print("End of division operation.")

divide_numbers(10, 2) 
divide_numbers(10, 0)  OutputDivision result: 5.0
End of division operation.
Error: Division by zero is not allowed.
End of division operation.
This Python code defines a function divide_numbers that performs division between two numbers x and y. It uses a try-except block to handle exceptions that may arise during division, specifically the ZeroDivisionError. If a division by zero occurs, the program prints an error message indicating that division by zero is not allowed. Otherwise, if the division operation succeeds without any exceptions, it prints the result of the division. The finally block is executed in both cases, indicating the end of the division operation.

Question 5

Question 6Name some common built-in exceptions in Python.

Accepted Answer

Some common built-in exceptions in Python are NameError, TypeError, ValueError, ZeroDivisionError, AttributeError, KeyError, IndentationError, IOError, IndexError, EOFError, SyntaxError and RuntimeError.

Question 6

Question 7What does the finally clause produce in a try...except block?

Accepted Answer

The 'finally' clause in a 'try-except' block is executed regardless of whether an exception occurs in the 'try' block or not. Its primary purpose is to ensure that certain actions or cleanup operations are performed, before the program exits or moves on to the next code block.

Question 7

Question 8Write syntax of raise statement.

Accepted Answer

The syntax of raise statement is:raise[exception name [, message/argument][, traceback]]

Source: This question is from Exception Handling, Computer Science &mdash; Class 12, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter Exception Handling: Question, Syntax, Raise, Statement, Exception Handling, Computer Science. These are fundamental topics in Computer Science that students are expected to master as part of the CBSE Class 12 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Computer Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberWrite programs with proper indentation and comments.
Trace through your code with sample inputs to verify correctness.
Explain the logic behind each step of your solution.
Familiarise yourself with common library functions and methods.
Related Questions from Exception HandlingQ1: Question 1 What all can be the possible outputs of the following code? def myfunc ( x = None ) :...
Q10: Question 10 Show how to modify the following code so that an error is printed if the number...
Q11: Question 11 Consider the code given below and fill in the blanks with appropriate error types: loop...
Q2: Question 2 Assertion (A): Exception handling code is separate from normal code. Reasoning (R):...
Q3: Question 3 Assertion (A): Exception handling code is clear and block based in Python. Reasoning...
Practice more questions from Exception Handling &mdash; Computer Science, Class 12 CBSE

Question 8

Question 9Differentiate between IOError and IndexError.

Accepted Answer

IOErrorIndexErrorThis error is raised if the file requested cannot be opened, or failure of I/O operation.This error is raised when an index is not found in a sequence, i.e., out of range or out of bounds.Examples of situations that can raise an IOError include: Opening a non-existent file for reading or writing, trying to read from a file that has been closed.Examples of situations that can raise an IndexError include: Accessing an index that is beyond the length of a list or tuple, trying to access a character in a string at an index that is outside the valid range of indices, using a negative index that is too large for the sequence.

Question 9

Question 10Show how to modify the following code so that an error is printed if the number conversion is not successful:val = input("Enter a number")  
pval = int(val)

Accepted Answer

val = input("Enter a number: ")
try:
    pval = int(val)
except ValueError:
    print("Error: Conversion to integer failed.")OutputEnter a number: 23

Enter a number: python
Error: Conversion to integer failed.
ExplanationIn this modified code the input function prompts the user to enter a number. The try block attempts to convert the input value to an integer using int(val). If the conversion is successful, pval will hold the integer value. If the conversion raises a ValueError (e.g., if the input is not a valid integer), the program jumps to the except block and prints an error message indicating that the conversion to an integer failed.

Question 10

Question 11Consider the code given below and fill in the blanks with appropriate error types:loop = 1
while loop == 1:
      try:
         a = int(input('Enter the first number: ')
         b = int(input('Enter the second number: ')
         quotient = a/b
      except ...............:
         print("Error: Please enter only numbers")
      except ...............:
         print("
 Error: Second number should not be zero")
      except ...............:
         print("
 Unsupported operation: Check the date type")
      else:
         print("Great")
      finally:
         print("Program execution completed")
loop = int(input('Press 1 to try again !')
continue

Accepted Answer

loop = 1
while loop == 1:
    try:
        a = int(input('Enter the first number: '))
        b = int(input('Enter the second number: '))
        quotient = a / b
    except ValueError:
        print("Error: Please enter only numbers")
    except ZeroDivisionError:
        print("
 Error: Second number should not be zero")
    except TypeError:
        print("
 Unsupported operation: Check the data type")
    else:
        print("Great")
    finally:
        print("Program execution completed")
loop = int(input('Press 1 to try again: '))
continueIn the code:The ValueError exception is used to catch errors that occur when the input cannot be converted to an integer (e.g., if the user enters a non-numeric value).The ZeroDivisionError exception is used to catch errors that occur when attempting to divide by zero (i.e., when the second number is zero).The TypeError exception is used to catch errors related to unsupported operations, such as performing arithmetic operations on incompatible data types.

Question 11

Question 4The order of exception handling in Python is try, followed by except, and then finally.

Accepted Answer

TrueReason — The order of exception handling in Python is as follows: first, the try block contains the code that may raise an exception. Then, the except block is used to handle specific types of exceptions that may occur within the try block. Finally, the finally block, if present, is executed whether an exception is raised or not.

Exception Handling

Assertions And Reasons

Solutions To Unsolved Questions

State True Or False