62.1.1. Raising an exception
def checkage(age):
if age < 0:
raise ValueError("age should be greater than or equal to zero")
print("age is valid")
# write your code here
try:
a = int(input("age: "))
checkage(a)
except ValueError as e:
print(f"('{e}',)")
finally:
print("executed in any condition")
62.1.2. Writing a program of raising an exception
try:
# write your code here
def checkage(a):
if a < 0:
raise ValueError("age should be greater than or equal to zero")
a = int(input("age: "))
checkage(a)
except ValueError:
print("age should be greater than or equal to zero")
finally:
print("i am always executed")
62.2.1. User Defined Exceptions - An overview
(a) Python supports a lot of in-built exceptions.
(b) All user defined exceptions have to be derived from the Exception class.
(c) Python built-in exceptions extend from the BaseException/Exception class.
62.2.2. An user defined exception example
class OurException(Exception):
# define constructor
def __init__(self,message):
self.message = message
class UsingUserException:
try:
a = int(input("a: "))
b = int(input("b: "))
#write code in try block
if b == 0:
raise OurException("b should be greater than 0")
d = a/b
print("division operation successful with result:",d)
except OurException as err:
print("user defined exception:", err.message)
62.2.3. Writing a user defined exception
try:
a = int(input("a: "))
b = int(input("b: "))
def d(a,b):
if b==0:
raise ArithmeticError("b should be greater than 0")
return(a/b)
print("division operation successful with result:", d(a,b))
except ArithmeticError as e:
print("user defined exception:",e)
