Python setattr() function

In this article, you will learn all about setattr function in python to set the value of specified attribute of specified obeject.

In the previous tutorial, we have seen all about lots of Python built-in functions along with examples.

Headings of Contents

1 setattr() function in Python
2 Python setattr example
- 2.1 Example:
- 2.2 Example:
3 Conclusion

setattr() function in Python

Python setattr function is a Python built-in function that is used to set the value of a specified attribute from a specified object. setattr method gives another facility to assign a default value if the specified attribute does not exist.

Syntax:

The syntax of setattr function in python is:-

setattr(object, attribute, value)

Parameter:

setattr function in python support three parameters.

object:- Required, An object.
attribute:- The name of the attribute you want to value from.
value:- Value to be return, If the specified attribute does not exist.

Return Value:

The return value of python setattr method is None.

Python setattr example

To understand python setattr function, we have created a simple class named Student.

Example:

class Student:
    name = 'Vishvajit'
    roll = 100
    course = 'BCA'
    occupation = 'Programmer'
    

#Use setattr function to set the value of occupation attribute.
result = getattr(Student, 'occupation')
print(result)
setattr(Student, 'occupation', 'Civi Engineer')
result = getattr(Student, 'occupation')
print(result)

Output

Programmer
Civil Engineer

What happens, If the specified attribute does not exist, let see.

Example:

class Student:
    name = 'Vishvajit'
    roll = 100
    course = 'BCA'
    occupation = 'Programmer'
    

#Use setattr function to set the value of the address attribute that does not exist.
setattr(Student, 'address', 'Civil Engineer')
result = getattr(Student, 'address')
print(result)

Output will be Civil Engineer

If you will execute the above program, A new attribute ‘address‘ will be created. To check, you can use the Python dir() function.

print(dir(Students))

Output

['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'address', 'course', 'name', 'occupation', 'roll']

Conclusion

So In this article, you have learned python setattr function to set the value of specified attribute from specified object along with various example.

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Python built-in functions