Python setattr() built-in function
From the Python 3 documentation
This is the counterpart of getattr(). The arguments are an object, a string, and an arbitrary value. The string may name an existing attribute or a new attribute. The function assigns the value to the attribute, provided the object allows it. For example, setattr(x, 'foobar', 123) is equivalent to x.foobar = 123.
Introduction
The setattr() function is a built-in Python function that allows you to set the value of an attribute of an object. It takes three arguments: the object, the name of the attribute (as a string), and the value you want to assign to that attribute.
This is particularly useful when the attribute name is determined dynamically at runtime. Instead of using dot notation (object.attribute = value), which requires you to know the attribute name beforehand, setattr() lets you use a variable.
Examples
Here’s how you can use setattr() to add or modify attributes:
class Person:
name = "John"
p = Person()
# Set the 'age' attribute to 30
setattr(p, 'age', 30)
print(p.age) # Output: 30
# Change the 'name' attribute
setattr(p, 'name', 'Jane')
print(p.name) # Output: Jane