Python - Class

Select correct python packages from following

• numpy

• opencv

• math

• matplotlib

• decimal

What is called when a function is defined inside a class?

• class

• method

• module

• function

A variable that is defined inside a method and belongs only to the current instance of a class is known as?

• Inheritance

• Instance variable

• Function overloading

• Instantiation

What will be output for the folllowing code?

class test:

def __init__(self,a):

self.a=a

def display(self):

print(self.a)

obj=test()

obj.display()

• Runs normally, doesn’t display anything

• Displays 0, which is the automatic default value

• Error as one argument is required while creating the object

• Error as display function requires additional argument

Suppose B is a subclass of A, to invoke the __init__ method in A from B, what is the line of code you should write?

• A.__init__(self)

• B.__init__(self)

• A.__init__(B)

• B.__init__(A)

What is the output of the following piece of code?

class Test:

def __init__(self):

self.x = 0

class Derived_Test(Test):

def __init__(self):

Test.__init__(self)

self.y = 1

def main():

b = Derived_Test()

print(b.x,b.y)

main()

• Error because class B inherits A but variable x isn’t inherited

• 0 1

• 0 0

• Error, the syntax of the invoking method is wrong

What does built-in function type do in context of classes?

• Determines the object name of any value

• Determines the class name of any value

• Determines class description of any value

• Determines the file name of any value

What type of inheritance is illustrated in the following piece of code?

class A():

pass

class B():

pass

class C(A,B):

pass

• Multi-level inheritance

• Multiple inheritance

• Hierarchical inheritance

• Single-level inheritance

What is the output of the code shown below?

g = (i for i in range(5))

type(g)

• class <’loop’>

• class <‘iteration’>

• class <’range’>

• class <’generator’>

What is the output of the following piece of code?

class A:

def __init__(self,x=3):

self._x = x

class B(A):

def __init__(self):

super().__init__(5)

def display(self):

print(self._x)

def main():

obj = B()

obj.display()

main()

• 5

• Error, class member x has two values

• 3

• Error, protected class member can’t be accessed in a subclass