Python | setattr () method

setattr () is used to set an attribute of an object to its value. In addition to the methods of assigning values ​​to class variables using constructors and object functions, this method provides an alternative way of assigning a 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: demonstration of how setattr () works

# Python code for demo # setattr () work   # initializing class class Gfg: name = ’GeeksforGeeks’    # object initialization obj = Gfg ()   # print object before setattr print ( "Before setattr name:" , obj.name)   # using setattr to change the name setattr (obj, ’ name’ , ’Geeks4Geeks’ )    # print object after setattr print ( "After setattr name:" , obj.name)

Output:

 Before setattr name: Python.Engineering After setattr name: Geeks4Geeks 

setattr () properties

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

Code # 2: demonstrating setattr () properties

# Python code for demonstration # setattr () properties   # initials class class Gfg: name = ’GeeksforGeeks’   # object initialization obj = Gfg ()    # print the object before setattr print ( "Before setattr name:" , str (obj.name))   # using setattr to name None setattr (obj, ’name’ , None )   # using setattr to initialize the new attribute setattr (obj, ’description’ , ’CS portal’ )   # print object after setattr print ( "After setattr name:" + str (obj.name)) print ( "After setattr description:" ,  str (obj.description))

Output:

 Before setattr name: Python.Engineering After setattr name: None After setattr description: CS portal