Exception

1. subclass of Exception need to place before parent Exception class

• Don’t

try:
    5/0
except Exception as e:
    print(e)
except ZeroDivisionError as e:
    print(e)

• Good

try:
    5/0
except ZeroDivisionError as e:
    print(e)
except Exception as e:
    print(e)

2. Secure your exception

• Good

def divide(a, b):

    result = None

    try:
        result = a / b
    except ZeroDivisionError:
        print("Type error: division by 0.")
    except TypeError:
        # E.g., if b is a string
        print("Type error: division by '{0}'.".format(b))
    except Exception as e:
        # handle any other exception
        print("Error '{0}' occured. Arguments {1}.".format(e.message, e.args))
    else:
        # Excecutes if no exception occured
        print("No errors")
    finally:
        # Executes always
        if result is None:
            result = 0

    return result