AttributesandMethods.md

Attributes and Methods

Attributes

• variable inside a class are called attributes.
• A class attribute is a Python variable that belongs to a class rather than a particular object.
• It is shared between all the objects of the class.
• Attributes are defined outside the constructor methods.

Syntax:

class <ClassName>:
    variablename=value

Example:

class Person:
    #Initialize Attributes
    name="python"
    age=25

How to get values of Class attribute using class objects?

• for accessing, class attributes use class name and dot(.) notation

Syntax:

classobject.variablename(attributename)

Example:

#Initilize class 
class Person:
    #Initialize Attributes
    name="python"
    age=25

#initialize the class object
p1=Person()

#To Access name Attributes
name=p1.name
print(name)
#Result:python

#To Access age Attributes
age=p1.age
print(age)
#Result:25

Output:

python
25
``

### Modify Class Attributes using Class object
- To modify class attributes use normal assignment(=) operator with class object and attributes name

Syntax:
```python
classobject.attributename=Value

Example:

#Initilize class 
class Person:
    #Initialize Attributes
    name="python"
    age=25

#initialize the class object
p1=Person()

#Name Attribute Value Before Modification
name=p1.name
print(name)
#Result:python

#Modify name value "python" to "python 3.7"
p1.name="python 3.7"

#Now just get the value of name Attribute
name=p1.name
print(name)
#Result:python 3.7

Output:

python
python 3.7

Methods

• A function inside a class is called a method.
• The method is accessible within the class.
• Methods can accept n number of parameters and return value using the return keyword.

How to define method?

• def keyword is used to define the method.
• The first parameter of the method is self.
• In the method, attributes are called with Classname dot(.)notation

Syntax:

Class <ClassName>:
    def MethodName(self,Paramter1,paramter2):
        #Code inside a method

Example:

#initialize the class
class Person:
    #initialize the Method
    def Display(self):
        print(Person.name)

How to call a method from a class using an object?

• to call a method from a class using class object we use dot(.) Notation

Syntax:

classobject.methodname()

Example:

#initilize the class
class Person:
   #initialize the methods
   def Display(self):
          print("the simple output from the Display method")

#initialize the class objects
p1=Person()

#call Display method from Person class using p1 class object
p1.Display()

#Result: the simple output from the Display method

Output:

the simple output from the Display method