CBSE solutions for कॉम्प्युटर सायन्स विद पाइथान [इंग्रजी] इयत्ता १२ chapter 3 - Classes in Python [Latest edition]

Give one word for the following:

A sort of constructor in Python.

Give one word for the following:

A region of a Python program where a namespace is directly accessible

Give one word for the following:

It returns the docstring of a class.

Give one word for the following:

It returns the string representation of an object.

Give one word for the following:

A method used to delete an attribute.

Define a namespace.

Give examples of namespaces with respect to Python.

Is data of different types treated differently in Python? Support your answer with an example.

Explain LEGB rule.

Is an object of a class mutable? Why/why not?

Explain the usage of keyword 'pass' in class definition.

What is the use of __init__? When is it called? Explain with an example.

Explain the importance of self in Python classes.

Differentiate between class attributes and instance attributes.

Explain __str__ with an example.

What do you mean by name mangling? Support your answer with a relevant example.

Differentiate between reference counting and automatic garbage collection with respect to Python.

If we want to make a method that is added dynamically to a class available to all the instances of the class, how can it be done? Explain with an example.

Predict the output of the given code snippet.

ptr=40
def result():
     print ptr
     ptr=90
def func(var):
     if var<=60:
     ptr=30
     print ptr
result()
func(60)
func(70)

Predict the output of the given code snippet.

ptr=50
def result():
     global ptr
     ptr=ptr+1
print ptr
result()
print ptr

Name the methods that can be used to access attribute of an object.

Name the methods that can be used to delete an attribute of an object.

Give the statement to check whether the attribute str exists in the class Test whose object is T1.

Give the statement to assign a value "Hello" to the attribute str of class Test and object T1.

Consider the following class definition:

class Yourclass
       marks=10
       name= "ABC"
       def __init__(self,marks,name):
              self.marks=marks
              self.name=name
       def display(self):
              print marks
              print name

Give the statement to create an object of class Yourclass.

In the code given what will be output if the following command is given: (Assuming YC is the object) YC.display()

class Yourclass
       marks=10
       name= "ABC"
       def __init__(self,marks,name):
              self.marks=marks
              self.name=name
       def display(self):
              print marks
              print name

Predict the output of the given class-attribute program.

class Match:
     ' "Runs and Wickets" '
     runs=281
     wickets=5
     def __init__(self,runs,wickets):
          self.runs=runs
          self.wickets=wickets
     print " Runs scored are : ",runs
     print "Wickets taken are : ",wickets
print "Test.__do__:", Match.__doc__
print "Test.__name__:", Match.__name__
print "Test.__module__:", Match.__module__
print "Test.__bases__:", Match.__bases__
print "Test.__dict__:", Match.__dict__

Create the class SOCIETY with following information:

society_name
house_no
no_of_members
flat
income

Methods

→ An __init__ method to assign initial values of society_name as "Surya Apartments", flat as "A Type", house_no as 20, no_of_members as 3, income as 25000.

→ Inputdata( ) - to read data members(society,house_no,no_of_members&income) and call allocate_flat().

→ allocate_flat( ) - To allocate flat according to income

→ Showdata( ) - to display the details of the entire class.

Define a class ITEMINFO in Python with the following description:

ICode (Item Code)
Item (Item Name)
Price (Price of each item)
Qty (quantity in stock)
Discount (Discount percentage on the item)
Netprice (Final Price)

Methods

→ A member function FindDisc( ) to calculate discount as per the following rule:

If Qty<=10         Discount is 0
If Qty (11 to 20)         Discount is 15
If Qty>=20         Discount is 20

→ A constructor( __init__ method) to assign the value with 0 for ICode, Price, Qty, Netprice and Discount and null for Item respectively

→ A function Buy( ) to allow user to enter values for ICode, Item, Price, Qty and call function FindDisc( ) to calculate the discount and Netprice(Price*Qty-Discount).

→ A Function ShowAll( ) to allow user to view the content of all the data members.