Unit 6 - Lesson 5

61.1.1. Try with many except blocks

(a) A try block can have more than one except block, each block handling a type of Exception.
(b) Based on the Exception/error that has been generated, the except block that is written to handle that exception is invoked.

61.1.2. Multiple Exception Handling Example

try:
	# take user inputs a and b and perform arithmetic operations
	a = int(input("a: "))
	b = int(input("b: "))
	if a == 0:
		f = fun1(a)
	a/b
	print("try successful")
	# Display success message	
# Handle division by zero exception	
except ZeroDivisionError:
	# Display corresponding error
	print("zero division error occurred")

# Handle NameError exception
except NameError:
	# Display corresponding error
	print("name error occurred")

except Exception:
	# Display corresponding exception
	print("exception occurred")
def fun1(n):
	print(n)

61.1.3. A try with multiple except blocks

try:
	# write your code
	a = int(input("a: "))
	b = int(input("b: "))
	c = a+b
	d = a/b
	e = a*b
	print("try successful")
except ZeroDivisionError:
	print("zero division error occurred")
except ArithmeticError:
	print("arithmetic error occurred")
except Exception:
	print("exception occurred")

61.1.4. More on Exception Handling

(a) It is good way of programming to write exception handling for a few lines of code.
(b) An advantage of exception handling is it separates normal code and exception handling code.
(c) Exceptions are passed from functions in the stack until they reach a function that knows how to handle them.

61.2.1. Try - Finally block.

(a) finally block will be executed whatever the outcome that happens in the try block.
(b) finally block is written after all the except blocks.

61.2.2. Writing an example to understand finally block

try:
	# write your code here
	a = int(input("a: "))
	b = int(input("b: "))
	c = a+b
	d = a/b
	print("try successful")
except ArithmeticError:
	print('arithmetic error occurred ')
except Exception:
	print('exception occurred')
finally:
	print('executed in any condition')

61.2.3. Using try finally block

try:
	a = int(input("a: "))
	b = int(input("b: "))
	c = a*b
	d = a/b
	print("try successful",c,d)
except Exception:
	print("exception occurred")

finally:
	print("executed in any condition")