Guides

1. NADAR SARASWATHI COLLEGE OF ARTS AND SCIENCE, THENI.
DEPARTMENT OF COMPUTER SCIENCE
STATIC METHOD AND ADDING METHOD
DYNAMICALLY
Presented by:
B.POORANI
I-MSC(CS)

2. STATIC METHOD
 Static method in python in comparison to instance methods, are not
bound to an object , object state cannot be accessed or changed by
static method.
 Python does not automatically give the self or class parameters to
static method.
 In actuality , you define utility method or group function that have
some logical relationship in a class using static method.
 It is very similar to defining a regular function to define static
method inside of a class.

3. EXAMPLE
Class name_of_class :
@staticmethod
def name_of_static_method(parameters_list):
pass
Print(‘static method defined’)
CALLING A STATIC METHOD:
• Without having to create a class instance , a static method can be
called directly from the class.
• Only static variables can be accessed by a static method ; instance
variables are not accessible.
SYNTAX :
name_of_class.static_method_name()

4. Creating a static method using @staticmethod decorator:
 add the @staticmethod decorator before the method definition to
make a method static.python includes a built-in function decorator
called @staticmethod that can be used to declare a method as static.
THE STATICMETHOD() FUNCTION:
 Some programs may define static method the old-fashioned way by
calling staticmethod() as a function rather than a decorator.
SYNTAX:
Staticmethod(function)

5. ADDING METHODS DYNAMICALLY
 The dynamic nature of python you can do many things in runtime , like add
method dynamically to an object or class.
Class person(object):
Pass
def play():
print(“I’m playing”)
P=person()
p.play=play
p.play()

6. Adding method to built-in types
 Python doesn’t allow to add method to built-in types , actually to any types
defined in C.The unique way around this is to subclass the type.
class UpperList(list):
pass
def to_upper(self):
for index, item in enumerate(self):
self[index]=item.upper()
UpperList.to_upper=to_upper
L=UpperList([‘I’,’g’,’o’,’r’])
l.to_upper()
Print (l)

7. Creating dynamic classes in python
 Classes can be created dynamically using
SYNTAX:
Type(name, bases, attributes)
Parameters:
Name: The user defined name of the class
Bases: a list of base classes, and its type is tuple.
Attributes: the data members and methods contained in the class.

8. Create classes dynamically in python
 A class defines a collection of instance variables and method to
specify an object type.
 A class can be used to make as many object instances of the type of
object as needed.an object is an identified entity with certain
attributes and behaviour
 Group of object having similar characteristic and behaviour are the
instance of the same class.

9.  Python is a dynamic programming languages and due to its flexibility
python has a significant advantage over statically typed languages.
 Python code can be dynamically imported and classes can be
dynamically created at run-time.
 Classes can be dynamically created using the type() function in
python. The Type () function is used to return the type of the object.
SYNTAX:
Type(object)

10. THANK YOU