The setattr() function sets the value of the attribute of an object.
Example
class Student: marks = 88 name = 'Sheeran' person = Student() # set value of name to Adam setattr(person, 'name', 'Adam') print(person.name) # set value of marks to 78 setattr(person, 'marks', 78) print(person.marks) # Output: # Adam # 78 setattr() Syntax
The syntax of the setattr() function is:
setattr(object, name, value)
If you want to get the attribute of an object, use getattr().
setattr() Parameters
The setattr() function takes three parameters:
- object - object whose attribute has to be set
- name - attribute name
- value - value given to the attribute
setattr() Return Value
The setattr() method returns None.
Example 1: How setattr() works in Python?
class Person: name = 'Adam' p = Person() print('Before modification:', p.name) # setting name to 'John' setattr(p, 'name', 'John') print('After modification:', p.name) Output
Before modification: Adam After modification: John
Example 2: When the attribute is not found in setattr()
If the attribute is not found, setattr() creates a new attribute an assigns value to it. However, this is only possible if the object implements the __dict__() method.
You can check all the attributes of an object by using the dir() function.
class Person: name = 'Adam' p = Person() # setting attribute name to John setattr(p, 'name', 'John') print('Name is:', p.name) # setting an attribute not present in Person setattr(p, 'age', 23) print('Age is:', p.age) Output
Name is: John Age is: 23
Also Read: