Python setattr() method

Python setattr() method is used to assign the object attribute its value. The setattr() can also be used to initialize a new object attribute. Also, setattr() can be used to assign None to any object attribute.

Example :

Output :

name: kiran

Python setattr() Function Syntax

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

Python setattr() Examples

How setattr() works in Python?

In the given example, we have defined a animal class with a class variable name and we are showing how can we set the value of the variable with setattr().

Output :

Before modification: lucky
After modification: Woozoo

When the attribute is not found in setattr() in Python

In this example, we have defined a Gfg class and we have set the name and descr variables to None after that we have set the variable with setattr() and printed it. After that, we created a variable named a value that was not found in the class with setattr() and printing it in Python.

Output : 

Before using setattr:
 name: None
 descr: None
After using setattr:
 name: GeeksForGeeks
 descr: CS Portal

New attribute created, gfg.value: 5

Python setattr() dict

Here we are creating attributes of the class 'Dict2Class' dynamically using setattr() function by passing a dictionary with some keys and values to the __init__() method of the class.

Output :

After Converting Dictionary to Class : 
Geeks 1223 Python
<class '__main__.Dict2Class'>

Python setattr() exception

Here we will create read-only attributes of the object using property() function in Python and if we try to set the attribute's value using setattr() function then an exception will rise.

Output :

---> 16 setattr(p, 'n', 'rajav')
AttributeError: can't set attribute