PE2 : Python Essentials 2 – Module 3 Test

PE2 : Python Essentials 2 – Module 3 Test

1. What will be the result of executing the following code?

   class Ex(Exception):
        def_init_(self,msg):
               Exception._init_(self,msg + msg)
               self.args = (msg,)
   
   try:
          raise Ex('ex')
   except Ex as e:
          print(e)
   except Exception as e:
          print(e)

   • it will print ex
   • it will print exex
   • it will print an empty line
   • it will raise an unhandled exception

2. A data structure described as LIFO is actually a:

   • list 
   • stack
   • heap
   • tree

3. What will be the output of the following code?

   class A:
       A = 1
   
   print(hasattr(A, 'A'))

   • 0
   • False
   • 1
   • True

4. What will be the effect of running the following code?

   class A:
       def_init_(self,v):
           self._a = v + 1
   
   a = A(0)
   print(a._a)

   • 2
   • The code will raise an AttributeError exception
   • 0
   • 1

5. What will be the result of executing the following code?

   class A:
       pass
   
   class B(A):
       pass
   
   class C(B):
        pass
   
   print(issubclass(C,A))

   • it will print 1
   • it will print False
   • it will print True
   • it will raise an exception

6. What will be the result of executing the following code?

   class A:
       def_str_(self):
           return 'a'
   
   class B:
       def_str_(self):
           return 'b'
   
   class C(A, B):
        pass
   
   o = C()
   print(o)

   • it will print b
   • it will print c
   • it will print a
   • it will raise an exception

7. What will be the result of executing the following code?

   class A:
       def a(self):
           print('a')
   
   class B:
       def a(self):
           self.a()
   
   
   o = C()
   o.c()

   • it will raise an exception
   • it will print a
   • it will print c
   • it will print b

8. What will be the result of executing the following code?

   try:
      raise Exception(1,2,3)
   except Exception as e:
      print (len(e.args))

   • it will print 1
   • it will print 2
   • it will raise as unhandled exception
   • it will print 3

9. What will be the output of the following code?

   class A:
      X = 0
      def __init__(self,v = 0):
          self.Y = v
          A.X += v
   a = A()
   b = A(1)
   c = A(2)
   print(c.X)

   • 2
   • 3
   • 0
   • 1

10. If the class’s constructor is declared as below, which one of  the assignments is valid?

    class Class:
         def __init__(self):
             pass

    • object = Class
    • object = Class()
    • object = Class(self)
    • object = Class(object)

11. What will be the result of executing the following code?

    def f(x):
        try:
            x = x / x
         except:
            print("a",end='')
         else:
            print("b",end='')
         finally:
            print("c",end='')
    f(1)
    f(0)

    • it will raise an unhandled exception
    • it will print bcac 
    • it will print acac
    • it will print bcbc 

12. If there is a superclass named A and a subclass named B, which one of the presented invocations should you put instead of the comment?

    class A:
         def __init__(self):
            self.a = 1
    class B(A):
         def __init__(self):
             # put selected line here.
             self.b = 2

    • A.__init__(self)
    • __init__()
    • A.__init__()
    • A.__init__(1)

13. What will be the result of executing the following code?

    class A:
         def__init__(self):
             pass
    a = A(1)
    print(hasattr(a,'A'))

    • 1
    • False
    • it will raise an exception
    • True

14. What will be the result of executing the following code?

    class A:
    ​​​​     def__init__(self):
              return 'a'
    class B(A):
          def__init__(self):
               return 'b'
    class c(B):
          pass
    o = C()
    print(o)

    • it will print c 
    • it will print b
    • it will print a 
    • it will raise an exception

15. What will be the output of the following code?

    class A:
         def__init__(self,v = 1):
             self.v =v
         def set(self,v):
             self.v = v
             return v
    a = A()
    print(a.set(a.v + 1))        

    • 2
    • 1
    • 3
    • 0

16. What will be the result of executing the following code?

    class A:
          v = 2
    class B(A):
          v = 1
    class C(B):
          pass
    o =C()
    print(o.v)

    • it will raise an exception 
    • it will print 2
    • it will print an empty line
    • it will print 1