Python | setattr() method

setattr() is used to assign the object attribute its value. Apart from ways to assign values to class variables, through constructors and object functions, this method gives you an alternative way to assign value.

Syntax : setattr(obj, var, val)

Parameters :
obj : Object whose which attribute is to be assigned.
var : object attribute which has to be assigned.
val : value with which variable is to be assigned.

Returns :
None

Code #1 : demonstrating working of setattr()

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# Python code to demonstrate
# working of setattr()
  
# initializing class 
class Gfg:
    name = 'GeeksforGeeks'
      
# initializing object
obj = Gfg()
  
# printing object before setattr
print("Before setattr name : ", obj.name)
  
# using setattr to change name
setattr(obj, 'name', 'Geeks4Geeks')
  
# printing object after setattr
print("After setattr name : ", obj.name)

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Output:

Before setattr name : GeeksforGeeks
After setattr name : Geeks4Geeks

Properties of setattr()

  • setattr() can be used to assign None to any object attribute.
  • setattr() can be used to initialize a new object attribute.

Code #2 : demonstrating properties of setattr()

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# Python code to demonstrate
# properties of setattr()
  
# initializing class 
class Gfg:
    name = 'GeeksforGeeks'
      
# initializing object
obj = Gfg()
  
# printing object before setattr
print("Before setattr name : ", str(obj.name))
  
# using setattr to assign None to name
setattr(obj, 'name', None)
  
# using setattr to initialize new attribute
setattr(obj, 'description', 'CS portal')
  
# printing object after setattr
print("After setattr name : " + str(obj.name))
print("After setattr description : ", str(obj.description))

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Output:

Before setattr name : GeeksforGeeks
After setattr name : None
After setattr description : CS portal



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