Example of using the optional finally clause in python exceptions. Reference: https://docs.python.org/2/tutorial/errors.html#defining-clean-up-actions

finally_clause_example.py

def divide(x, y):
	try:
		result = x / y
	except ZeroDivisionError:
		print "division by zero!"
	else:
		print "result is", result
	finally:
		print "executing finally clause"

divide(2, 1) # finally clause executed when no expection raise
# Output:
#  result is 2
#  executing finally clause
divide(2, 0) # finally clause executed when exception is handled
# Output:
#  division by zero!
#  executing finally clause
divide("2", "1") # finally clause executed and unhandled exception re-raised
# Output:
#  executing finally clause
#  Traceback (most recent call last):
#  File "<stdin>", line 1, in ?
#  File "<stdin>", line 3, in divide
#  TypeError: unsupported operand type(s) for /: 'str' and 'str'