Section 9.6 Check Point Questions5 questions 

9.6.1
What problem arises in running the following program? How do you fix it? 
class A:
    def __init__(self, i):
       self.__i = i

def main():
    a = A(5)
    print(a.__i)

main() # Call the main function
9.6.2
Is the following code correct? If so, what is the printout? 
 1  def main():
 2      a = A()
 3      a.print()
 4
 5  class A:
 6      def __init__(self, newS = "Welcome"):
 7          self.__s = newS
 8
 9      def print(self):
10          print(self.__s)
11
12  main() # Call the main function
9.6.3
Is the following code correct? If not, fix the error. 
class A:
    def __init__(self, on):
        self.__on = not on

def main():
    a = A(False)
    print(a.on)

main() # Call the main function
9.6.4
What are the benefits of data hiding? How is it done in Python?
9.6.5
How do you define a private method?