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Python finally Keyword

By IncludeHelp Last updated : December 07, 2024

Description and Usage

The finally is a keyword (case-sensitive) in python, it is a part of "try...except...finally" block, it is used to define a block (of coding statements) to execute finally i.e. no matter there is an exception or not in the "try" block. The finally block executes in any case.

Syntax

Syntax of finally keyword:

try:
  statement(s)-1
except:
  statement(s)-2
finally:
  statement(s)-3

While executing the statement(s)-1, if there is any exception raises, control jumps to except block and statement(s)-2 executes, in case of finally block – no matter there is an exception in try block or not, statement(s)-3 executes in any case.

Sample Input/Output

Input:
a = 10
b = 0

try:
  # no error
  result = a%b
  print(result)
    
except:
  print("There is an error")
finally:
  print("Finally block, Bye Bye")

Output:
There is an error
Finally block, Bye Bye

Example 1

Find modulus of two number and handle exception, if divisor is 0.

# python code to demonstrate example of 
# try, except, finally keyword 

# Find modulus of two number and 
# handle exception, if divisor is 0

a = 10
b = 3

try:
    # no error
    result = a%b
    print(result)
    
    # assign 0 to b
    # an error will occur
    b = 0
    result = a%b
    print(result)
    
except:
    print("There is an error")
finally:
    print("Finally block, Bye Bye")

Output

1
There is an error
Finally block, Bye Bye	

Example 2

try:
    print("Dividing numbers...")
    result = 10 / 0
except ZeroDivisionError:
    print("Cannot divide by zero!")
finally:
    print("Execution of finally block")

Output

Dividing numbers...
Cannot divide by zero!
Execution of finally block