Q.What is the use of finally clause? Use finally clause in the problem given in Question No. 7.

The finally clause in Python's exception-handling mechanism guarantees that a block of code executes regardless of whether an exception occurred in the try block or not — whether the try block completed normally, an exception was raised and caught by an except, or an exception was raised and never caught by any except at all. It must be the last clause of the try statement, after every except block and after any else clause. This makes finally ideal for cleanup work — such as closing a file — that must always run.

Applying finally to Question No. 7's program

Question 7 gives this fill-in-the-blanks program (with ValueError, ZeroDivisionError, and finally as the three answers):

print(" Learning Exceptions...")
try:
    num1 = int(input("Enter the first number"))
    num2 = int(input("Enter the second number"))
    quotient = (num1/num2)
    print("Both the numbers entered were correct")
except ValueError:             # to enter only integers
    print(" Please enter only numbers")
except ZeroDivisionError:      # Denominator should not be zero
    print(" Number 2 should not be zero")
else:
    print(" Great .. you are a good programmer")
finally:                       # to be executed at the end
    print(" JOB OVER... GO GET SOME REST")

The finally clause is already the blank filled in at the end of Question 7's own program — the line print(" JOB OVER... GO GET SOME REST") inside it runs every time the program is run, no matter which of the three cases below happens: …

Understanding the finally clause

The try statement can have an optional finally clause. Statements written inside finally always execute, regardless of whether an exception occurred in the try block, and regardless of whether that exception was handled by an except clause. This is exactly why finally is commonly used for cleanup work — such as closing a file — that must happen no matter what.

If a finally clause is used, it must be the last clause of the try statement, after every except block and after the optional else clause.

Question 7's program

Question 7 asks you to fill in the blanks of this program, and the correct blanks are ValueError, ZeroDivisionError, and finally:

print(" Learning Exceptions...")
try:
    num1 = int(input("Enter the first number"))
    num2 = int(input("Enter the second number"))
    quotient = (num1/num2)
    print("Both the numbers entered were correct")
except ValueError:             # to enter only integers
    print(" Please enter only numbers")
except ZeroDivisionError:      # Denominator should not be zero
    print(" Number 2 should not be zero")
else:
    print(" Great .. you are a good programmer")
finally:                       # to be executed at the end
    print(" JOB OVER... GO GET SOME REST")

Question 9 asks specifically for the finally clause to be used in this program — which the fill-in-the-blanks answer to Question 7 already supplies as its third blank. The finally block is:

finally:
    print(" JOB OVER... GO GET SOME REST")

Tracing all three cases

• Non-integer input (e.g., the user types "abc" for num1 or num2): int() raises ValueError. The first except block catches it and prints " Please enter only numbers". Because an exception occurred, else is skipped. finally still runs, printing " JOB OVER... GO GET SOME REST".

• Zero as the second number: both inputs convert to integers successfully, but num1/num2 raises ZeroDivisionError. The second except block catches it and prints " Number 2 should not be zero". Again else is skipped, and finally still runs. …