How Can I Access and Modify Object Attributes in Python Using Strings?

Accessing Object Attributes by String

Consider a scenario where you have an object t and a string x representing an attribute name of t. How can you retrieve or modify the value of this attribute?

The Python language provides convenient mechanisms for this operation:

getattr() and setattr() Functions:

Python offers the getattr() and setattr() built-in functions for accessing and modifying object attributes dynamically. These functions take the following syntax:

getattr(object, attrname) # Retrieves the attribute value
setattr(object, attrname, value) # Sets the attribute value

Example:

In the given code snippet:

class Test:
   def __init__(self):
       self.attr1 = 1
       self.attr2 = 2

t = Test()
x = "attr1"

To get the value of the attribute represented by x, you can use:

x = getattr(t, 'attr1')

To set the value of the attribute represented by x to 21:

setattr(t, 'attr1', 21)

This approach provides a flexible and dynamic way to access and modify object attributes, especially useful when working with dynamic data structures or strings representing attribute names.

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